cfa pf of error codes v3

Chick-fil-A

Pressure Fryerand

Open Fryer

Warning Messagesand Error Codes

Document Date: June 21, 2002 **Preliminary**

Tim LandwehrSoftware EngineerHenny Penny Corp.

UNCONTROLLED DOCUMENTThis is an uncontrolled document. All information is subject to change without notification!Each page within is dated in the lower right corner. The information presented was believed to be accurate at the

time it was published, but changes in design and operation may have been made since that time. Also, inaccuracies in the documentation may have been discovered after this copy was printed and distributed. Since this document

is not managed by a controlled distribution and update list, you cannot be assured that the information youhave here is accurate, or that this copy of the document is the latest, most up-to-date revision.

CFA Fryers ----- C O N F I D E N T I A L ----- Error Codes

tal / CFA-PF-OF-Error-Codes-v3.doc page 2 of 30 06/21/02 8:25 AM

CFA Pressure Fryer, Open Fryer

This document describes the program settings and messages of the Chick-fil-APressure Fryer controller, software version 1.21, and Chick-fil-A Open Fryer controller,software version P1.15. These controllers were first available in June, 2002.

--- NOTICE ---The decision has not yet been made as to whether this information should beconfidential or whether it may be freely distributed to interested parties, includingcustomers and restaurant personnel.

Until such a decision is made, the information presented here should be keptconfidential, and in general should not be revealed to outside parties or to restaurantpersonnel.



Document Revision History

Version 3 6/21/2002Added E-70A Error (Fan Vac Jumper Missing)

Additional info for W-1 (low voltage warning) and E-25, E-26 Error Codes (amps errors)

Version 2 5/23/2002Added this "Document Revision History" section.

Updated line art of PF panel -- adds 0:45 to product #6.

Updated line art of OF panel -- changes product #2 from Potato Roundabouts to HashBrown.



Chick-fil-A Pressure Fryer Controller:..........................................................................................5

Chick-fil-A Open Fryer Controller: ...............................................................................................5

Warning Messages ......................................................................................................................6

W-1 ..............................................................................................................................................7

W-2 ..............................................................................................................................................8

W-3 ..............................................................................................................................................9

W-4 ............................................................................................................................................10

W-5 ............................................................................................................................................10

W-6 ............................................................................................................................................11

W-7 ............................................................................................................................................12

W-9 ............................................................................................................................................13

"OIL TOO HOT")........................................................................................................................14

Error Codes ...............................................................................................................................15

Error Codes -- Order of Priority .................................................................................................15

E-4 .............................................................................................................................................16

E-5 .............................................................................................................................................16

E-6 .............................................................................................................................................17

E-10 ...........................................................................................................................................18

E-15 ...........................................................................................................................................19

E-20 A........................................................................................................................................20

E-20 B........................................................................................................................................21

E-20 C........................................................................................................................................22

E-20 D........................................................................................................................................23

E-25 ...........................................................................................................................................24

E-26 ...........................................................................................................................................25

E-41 ...........................................................................................................................................26

E-46 ...........................................................................................................................................27

E-70 A........................................................................................................................................28

E-70 B........................................................................................................................................29

E-92 ...........................................................................................................................................30



Chick-fil-A Pressure Fryer Controller:

Chick-fil-A Open Fryer Controller:



Warning MessagesWhile Error Codes (below) generally result from some kind of hardware or equipmentproblem, Warning Message displays are frequently the result of operator error:overloading the fryer, for example, or starting a cook cycle before the fryer hasrecovered to setpoint.

In addition, Warning Messages may alert the user to suspected hardware problems --like failed heating elements -- where the suspicion is based on observed temperaturebehavior rather than direct sensing of the heater operation. In general, WarningMessages are activated based on user actions or based on the actual performance ofthe fryer.

When a Warning Message is generated, the controller shows a Warning Code ("W-3")in the left side of the display, and shows a descriptive message ("WAS NOT READY","LOADED BEFORE READY LIGHT") in the rest of the display. The speaker sounds awarbling tone -- like a telephone sound -- for about two seconds, then continues tosound a short beep once per second for the rest of the message display, then repeats.

Warning Messages are canceled by pressing the CANCEL button (#2). All warningsare rescinded as soon as the CANCEL button is pressed, though another, pendingwarning may immediately take its place.

WarningCode Description

W-1 Voltage Low: Check Plug, Receptacle.

W-2 Slow Heat-up: Check Coils, Connections, Contactors.

W-3 Was Not Ready: Loaded Before "Ready" Light

W-4 Slow Cooking: Frozen Prod? Too Much Prod?

W-5 Slow Cooking: Wait For "Ready" Light Before Loading.

W-6 Slow Cooking: Check Coils, Contactors, and Wiring.

W-7 Low Amps: Check Coils, Connections, Contactors.

W-9 Discard Product: Overcooked.

(no code) Oil Too Hot (compared to present setpoint temperature)



WarningCode Display Message Description

W-1 "VOLTAGE LOW"

"CHECK PLUG,""RECEPTACLE"

The controller monitors one leg (typ. L1-L2) of the incoming linevoltage being supplied to the fryer. If the voltage drops below aprogrammed limit (normally 90% of nominal voltage), thecontroller signals a "Voltage Low" alarm.

Press the "Cancel" button (#2) to cancel the message.

If low voltage is detected while cooking, the warning messagewill be displayed at the conclusion of the cook cycle.

If low voltage is detected while not cooking, the Voltage Lowwarning is displayed immediately.

If the voltage is continuously or repeatedly low while notcooking, the warnings will sound only every 30 minutes, toavoid continuously displaying the warning.

The line voltage reading is heavily averaged by the controller,so a brief one- or two-second dip in the voltage will generallynot trigger the warning.

Note: The controller monitors the Line Voltage by monitoringthe 24 VAC side of the transformer. Regardless of the nominalsupply voltage of the fryer (120, 208, 240, etc.), if the incomingline voltage is low, the 24 VAC output of the transformer will beproportionally low as well. Keep in mind that the controllermonitors 24 VAC side alone and does not actually read thehigh voltage side of the transformer.

Consequently, the Low Voltage warning is fully functional evenif the T-11 Fryer Supply Volts setting is not set, or is setincorrectly. False Low Voltage warnings will not occur as aresult of an improperly programmed Fryer Supply Volts value.

Note: All Line Voltage monitoring is handled internally as a"percent of nominal", i.e. 24 VAC = 100%. The display thatshows line voltage as an actual AC Volts value -- "206V", forexample -- is actually a calculated value based on the "percentof nominal" volts reading multiplied by the programmed "FryerSupply Volts" setting (Tech Mode, T-11).

If the T-11 setting is programmed wrong, the AC Voltsdisplay can be very misleading. For example, assume a 208Vfryer was set for Fryer Supply Volts = 120V. If the voltage wasactually 95% of nominal, the controller would display this as0.95 x 120V, or "114 V". This would look very misleading for a208V fryer.

Because of this, the "percentage" voltage display shouldalways be considered the most reliable indicator of actualvoltage status.




W-2 "SLOW HEAT-UP"

"CHECK COILS,""CONNECTIONS,""CONTACTORS,"

Each time the fryer is turned on (morning startup, and power upafter filtering) the controller monitors the heat-up rate from270°F to 310°F. (If the fryer is above 270°F at power on, themonitoring is skipped.)

If the peak heat-up rate does not achieve a programmed limit,and three of the last four heat-ups also have failed to achievethat limit, the controller activates the "Slow Heat-Up" warning.

As the warning message indicates, the slow heat-up rate couldbe due to a failed heating coil or faulty connections orcontactors. Press the "Cancel" button (#2) to clear the warningmessage.

If any Low Voltage events occurred during the heat-up then thecontroller will not generate a Slow Heat-up Warning. In thiscase, the low voltage condition already explains why the heat-up would be slower than normal.

Note that low heat-up rates can sometimes be caused byadding oil or stirring the oil during the heat-up, or possibly byhaving the oil level way too high. However, the controller onlyactivates the warning message display if three of the last fourheat-ups were unacceptable, so it would take repeated eventslike this to activate a false "Slow Heat-up" warning.




W-3 "WAS NOT READY"

"LOADED BEFORE"""READY" LIGHT"

This warning message is activated at the start of a cook cycle ifthe controller determines that the user loaded product beforethe oil temperature had returned to the "Ready" range.

The oil temperature should always be in the Ready range (5°Fbelow setpoint to 15°F above setpoint) before product is loadedand a cook cycle is started.

If the oil temperature was below the Ready range when theproduct was loaded, the "Was Not Ready" warning will beactivated as soon as the cook cycle is started. Press the"Cancel" button (#2) to clear the warning message.

Note: This warning is not activated when the oil temperature ison the high side of the ready range. See "W7 -- Oil Too Hot"warning below.

It is understood that placing food into the oil will immediatelycause a temperature drop -- possibly dropping the temperatureout of the Ready range by the time the start button is pressed.For this reason, the controller does not check the temperatureonly at the moment the cook cycle is started. Instead, the "WasNot Ready" warning is activated only if the oil temperature wasbelow the Ready range for an entire N-second period (typ. 60seconds) before the start button was pressed.




W-4 Pressure Fryer:

"SLOW COOKING"

"FROZEN PROD?""TOO MUCH ?"

Open Fryer:

"SLOW COOKING"

"TOO MUCH" "PRODUCT?"

A "Slow Cook" Warning is generated at the conclusion of acook cycle if the actual, elapsed time of that cook cycleexceeds a warning limit for that particular product.

The elapsed time of any cook cycle can be more or less thanthe programmed time due to the Load Compensation feature.This feature, which helps assure consistent product doneness,automatically runs the cooking timer countdown more slowlywhen the temperature drops lower than normal.

A bigger-than-normal product load will generally result in adeeper-than-normal temperature drop, which in turn will resultin a longer-than-normal cook time (due to load compensation).However, anything that reduces the heating capacity -- such asa failed element or bad contactor -- will also result in a deeper-than-normal temperature drop, and also will result in stretchedcook time.

In the case of the W-4 warning, the controller has alreadydetermined that the heating elements and voltage appear okay,and that the fryer was in the Ready range at the start of thecook cycle. Since no other cause is found to explain the slowcooking problem, it is presumed that the user was either tryingto cook too much product at once, or was cooking product thatwas frozen when it shouldn't have been (pressure fryer only).

Press the "Cancel" button (#2) to clear the Slow Cook warning.Unless a "Discard" warning was displayed just before the SlowCook warning, the food is acceptable for use.

W-5 "SLOW COOKING"

"WAIT FOR"""READY" LIGHT"

"BEFORE" "LOADING..."


(See W-4 above for details about how the Load Compensationfeature can stretch cook time.)

In the case of the W-5 warning, the user started the cook cyclebefore the oil temperature had returned to the Ready range.Since the fryer started out at a lower-than-normal temperature,it is likely to remain lower-than-normal throughout the entirecook cycle. Consequently, "starting before the fryer was ready"is presumed to be the root cause of the Slow Cook problem.





W-6 "SLOW COOKING"

"CHECK COILS,""CONTACTORS,""AND WIRING."



In the case of the W-6 warning the controller has alreadydetermined that the voltage appears okay and that the fryerwas in the Ready range at the start of the cook cycle.

However, if the most recent heat-up activated a "Slow Heat-up"warning, the controller will presume there is a problem with theheating coils or contactors, etc. Consequently, the controllerwill assume the Slow Cook problem is actually the result of aheat capacity problem.





W-7 "LOW AMPS"

"WAS 37 25 25"

"CHECK COILS,""CONNECTIONS""CONTACTORS"

Electric Fryer Only:The "Low Amps" warning is activated if the amperage reading(electrical current) for any of the three amps sensors falls belowthe CFA-26 "MIN ACCEPT. AMPS" setting (when the heatoutput is on).

The Min and Max amps limits are set automatically when the"Fryer Supply Volts" setting (step T-11) is programmed in TechMode.

To view the Min and Max amps limits, activate Info Mode bypressing INFO and PROG at the same time, then press INFOonce to circle around to the Amps display on the last step.Press the DOWN button to view the Low Limit. Press DOWN asecond time to view the High Limit.

Under most circumstances, this warning is not the result of alow voltage situation, as the W-1 "LOW VOLTAGE" warningtakes precedence over this "LOW AMPS" warning. Typically,this warning would result from a contactor problem, a failedheating element, a wrong wattage or wrong voltage element, orsome other wiring problem.

When the warning message is displayed the actual ampsvalues are shown. If the heat is presently on and one or moreof the readings is still too low, the warning display will show"NOW xx xx xx", indicating that the fault condition is stillpresent. In this case, the three amps readings are "live"values, indicating the present reading for each amps sensor.

If the heat is not presently on, or if it is on now but all threeamps readings are presently okay, then the warning messagewill show "WAS xx xx xx". In this case, the three ampsreadings displayed are "latched" values from the last time thefault condition was observed.

W-7 Possible Causes:

1. Wrong "Fryer Supply Volts" setting. The controller sets theMin and Max Amps Limits based on the programmedVoltage setting. Check Tech Mode step T-11 and confirmthe nominal voltage is set correctly.

2. Wrong wattage heating element installed, failed heatingelement, bad connection, or bad contactor, etc.

3. Fault in the amperage monitoring circuits.

Note: All Amps errors can be disabled by simply unpluggingthe transducer harness. Do this ONLY if you are absolutelycertain that the problem is due to a defective current transducerassembly and not a fault in the fryer.




W-9 "DISCARD""PRODUCT"

"OVER-COOKED"

A "Discard" Warning is generated at the conclusion of a cookcycle if the actual, elapsed time of that cook cycle exceeds theabsolute maximum allowed for that particular product.


If the overall duration of a cook cycle exceeds the programmedDiscard limit, the controller will -- at the end of the cook cycle --begin displaying the Discard warning message and sounding acontinuous pulsed tone. This "discard" tone is distinctlydifferent from the normal "warbling" warning tone.

Press the "Cancel" button (#2) to clear the Discard warning. Inmost cases, the Discard warning will be immediately followedby a Slow Cook warning, which will try to identify the root causeof the cooking problem.

In the case of a Discard warning, the food is to be discardedimmediately and not served. Even though the color of theproduct may look acceptable, the product has cooked so longthat it is too dry (internally) to be considered acceptable.




(nocode)

"OIL TOO HOT"

"338°F"(actual oil temp.)

The "Oil Too Hot" warning is activated if the oil temperature isabove the Ready range (setpoint + 15°F) at the start of a cookcycle.

Note: This warning is not intended to imply a hazardoussituation, or imply that the oil is overheated to an unsafe level.Rather, it is simply indicating that the oil is too hot for theproduct being cooked.

If the oil is above the Ready range at the start of a cook cycle,the controller sounds a continuous warbling tone andalternately displays "OIL TOO HOT" and the current oiltemperature.

Unlike other warnings, the "Oil Too Hot" warning cannot becanceled by pressing the "Cancel" (#2) button. Instead, thewarning message and alarm tone continue until thetemperature drops down into the acceptable temperaturerange, or until the end of the cook cycle is reached. (OnPressure Fryers, the alarm will also stop if a second cookinterval is reached.)

In most cases, the product load will cause the temperature todrop fairly quickly, so the "Oil Too Hot" display will generallycancel itself pretty soon unless the oil temperature was wayover setpoint at the start.

All normal cooking functions continue in the background duringthis warning, so as soon as the Oil Too Hot warning clears, thenormal cook display will return.



Error CodesError Code displays generally result from some hardware problem or anomaly. TheE-15 Drain Open code is an exception, as it is really the result of operator error: openingthe drain when the fryer is turned on, or turning the fryer on when the drain is open.

When an error code is generated, the error code itself (i.e. "E-15") is displayed in the leftside of the display window, and a descriptive message ("DRAIN IS OPEN") is displayedin the right side. The speaker sounds "whoop-whoop-whoop-whoop-whoop" followedby a quiet pause (about 10 seconds or so), then repeats.

Press any button to acknowledge the error and silence the alarm. Some error codeswill vanish as soon as they are acknowledged, while other codes will remain for as longas the hardware problem persists.

Error Codes -- Order of PriorityThe following table lists the order of priority for the error codes in the Chick-fil-APressure Fryers and Open Fryers. When multiple errors are detected simultaneously,only the highest priority error code is reported. If that error is corrected or otherwisevanishes, then the next highest priority error code will be reported.

Error Code Description

1. E-4 Controller (CPU) Circuit Board Overheated

2. E-92 24 Volt Current Limiter (Fuse) Tripped

3. E-10 Electo-mechanical High Limit Device Tripped

4. E-15 Drain Handle Open (While Fryer is On)

5. E-6 Main Temperature Probe Failure

6. E-5 Oil Overheated (Software high limit)

7. E-26 Heat Amps Locked On (Electric Fryer Only)

8. E-25 Heat Amps Too High (Electric Fryer Only)

9. E-70B Power Switch Failure or Wiring Error

10. E-70A Fan Vacuum Input Jumper Wire Missing

11. E-20 Gas Ignition Errors (Gas Open Fryer Only)

12. E-41 Programmed Settings Lost

13. E-46 EEPROM Memory Write Error



Error Code Display Message Description

E-4 "E-4 CPU ""E-4 TOO ""E-4 HOT "

Controller (CPU) Circuit Board Overheated.This error is generated when the thermistor temperaturesensor on the controller board reaches or exceeds 160°F.

The error will disappear automatically, with no userintervention, if the temperature drops below 160°F again.

E-4 Possible Causes:1. Controller actually too hot, due to missing insulation or

blocked airflow.

2. Moisture or contamination on the controller boardaffecting the analog circuits or a-to-d converter chip.

3. CPU° calibration incorrect.

4. Failure of the thermistor temperature sensor oncontroller board (very rare possibility).

E-5 "E-5 FRYER ""E-5 TOO ""E-5 HOT "

Oil Overheated (Software high limit).This error is generated when the pot temperature reading(RTD temperature probe) reaches or exceeds 405°F.

The error will disappear automatically, with no userintervention, if the pot temperature drops below 405°Fagain.

E-5 Possible Causes:1. Oil too hot (over 405°F), due to heat contactor locked

on, heat relay on the I/O board locked on, or failure(shorted on) of heat output driver chip on the controllerboard.

2. Intermittent failure of the RTD Temperature Probe insuch a way that it sometimes reads artificially lowvalues and consequently overheats the oil. Controllerthinks everything is fine, but is regulating oiltemperature well above the correct value. When probereading returns to "accurate" reading, controllerimmediately sees that the oil temperature is too hot.

3. Failure of the Temperature Probe in such a way that itreads artificially high values (greater than 405°F) butnot an open circuit.

4. Moisture or contamination on the controller boardaffecting the analog circuits or a-to-d converter chip.This can cause failures 2 and 3 noted above.



E-6Open Circuitor Unplugged:

"E-6 A FRYER""E-6 A TEMP""E-6 A SENSOR""E-6 A FAILED"

Short Circuitor Short to Ground:

"E-6 B FRYER""E-6 B TEMP""E-6 B SENSOR""E-6 B FAILED"

Main Temperature Probe FailureThis error indicates a problem with the RTD temperatureprobe in the frypot.

The E-6 error is generated when the temperature probeinput shows abnormally low values (shorted, or nearlyshorted) or abnormally high values (open circuit, or nearlyso).

The error will disappear automatically, with no userintervention, if the temperature probe resumes goodreadings.

Subcodes: E-6A = Open Circuit / High ReadingE-6B = Short Circuit / Low Reading

E-6 Possible Causes:1. Failure of the RTD sensor inside the probe, due to

physical damage to the probe inside the frypot. Trysimply plugging on a good probe and powering up tocheck it out before actually replacing the probe in thefrypot.

2. E-6A only: Probe unplugged from controller, or badcrimp or connection in the temperature probeconnector (especially if E-6 is intermittent).

3. Probe wires cut or broken, or shorted to sheet metal.

4. On Pressure Fryers: bad connection inside thecontroller package, on the two-wire connector betweenthe I/O board and the controller board.

5. Failure of 12 volt DC supply on the I/O board. The 12volt supply feeds the analog 5v regulator. To test if the12v supply has failed, check to see if the speakerworks normally or not. A failed 12v supply will result inno speaker sounds (no key beeps), or perhaps very,very faint sounds. Also, the WAIT and READY lights(above the display digits, in the center) will generallynot light up at power up if the 12v supply has failed.

6. Failure of the small 5 Volt regulator (on the controllerboard) that supplies 5v DC to the analog circuits. (Veryrare failure.)

7. Moisture or contamination on the controller boardaffecting the analog circuits or a-to-d converter chip.



E-10 "E-10 HIGH LIMIT""E-10 TRIPPED "

Electo-mechanical High Limit Device Tripped.The electro-mechanical high limit (bulb and capillary) is oneof the series-connected safety interlocks. The high limitdevice must provide continuity in order for the fryer heatingcircuits to operate.

High limit devices must be manually reset. Once the highlimit trips out and opens up the circuit, it must be reset bymanually pressing a reset button (on the high limit module)after the bulb and capillary have cooled down sufficiently.

Wiring from the I/O board monitors the continuity of thehigh limit by sending 24 VAC out on one wire leading to thehigh limit and confirming that 24VAC is returning on theother wire.

The E-10 error is generated when the circuit on the I/Oboard that monitors the high limit indicates that the highlimit is "open" -- no 24 VAC is coming back from the highlimit.

The error will disappear automatically, with no userintervention, if the monitor circuit detects 24 VAC again.

E-10 Possible Causes:1. High Limit device is actually tripped, due to dry firing or

due to the oil overheating as described for the E-5error. E-10 error will persist -- even if the fryer is turnedoff and back on -- until the high limit is manually reset.

2. High Limit device is defective or damaged. Mechanicaldamage to the high limit bulb or the fragile capillarytube can occur when user scrapes the frypot. A dent orcompression in the high limit bulb can result in a highlimit that trips out prematurely, at relatively low oiltemperatures. A leak in the bulb or capillary can resultin a permanently "tripped" high limit.

3. High limit wiring is damaged or disconnected: cut wireleading to or from the high limit, loose connection at thehigh limit, or bad crimp in the terminals that attach tothe high limit.

4. Very low oil level -- heating fryer when then oil level isbelow the temperature probe can cause the oil tooverheat.

5. Failure of the opto-coupler chip on the I/O board thatmonitors the 24 VAC returning from the high limit. Ifthe Info Mode "Digital Inputs" display (with the powerswitch ON) shows "V_DS", or possibly shows anintermittent "H" in between the V and D, it is likely thatthe opto chip has failed. Replace the I/O board, butonly if "D" is shown when "H" is not.



E-15 "E-15 DRAIN ""E-15 IS ""E-15 OPEN "

Drain Handle Open (While Fryer is On).This error is generated when the frypot drain handle isopened with the power switch in the ON or COOK position.

The error will disappear automatically, with no userintervention, if the drain handle is closed again, or if thefryer is turned off.

The drain microswitch is one of the series-connected24 VAC interlock circuits. Wiring from the I/O boardmonitors the continuity of the drain switch by sending24 VAC out on one wire leading to the drain switch andconfirming that 24 VAC is returning on the other wire.

When functioning correctly, the drain handle microswitchshould provide continuity only when the drain is fullyclosed, and should be open circuit as soon as the handle isopened.

E-15 Possible Causes:1. Drain Handle open when power switch is on.

2. Drain Handle Microswitch is damaged or not properlyadjusted (no continuity on switch even when handle isclosed). Open the mounting bracket housing andcheck the switch. If manually pressing on the levermakes the E-15 disappear, then the switch is operatingbut needs to be adjusted so the lever properly contactsthe drain handle shaft.

3. Damaged or disconnected wiring to the drain handlemicroswitch.

4. Failure of the opto-coupler chip on the I/O board thatmonitors the 24 VAC returning from the drain handlemicroswitch. If the Info Mode "Digital Inputs" display(with the power switch ON) shows "VH_S", or possiblyshows an intermittent "D" in between the H and S, it islikely that the opto chip has failed. Replace the I/Oboard, but only if the "S" is shown when the "D" is not.



E-20 A "E-20 A FAN SENSR ""E-20 A STUCK ON "

Gas Open Fryer Only:

Fan Vacuum Sensor Contacts Closed While Fan is Off.This error is generated when the fryer sees continuity at thevacuum sensor and the fan has not yet been turned on.

The vacuum sensor is one of the series-connected 24 VACinterlock circuits. Wiring from the I/O board monitors thecontinuity of the vacuum sensor by sending 24 VAC out onone wire leading to the sensor and checking to see if24 VAC is returning on the other wire.

When functioning correctly, the vacuum sensor shouldprovide continuity only when the draft fan is running anddrawing air through the heat exchanger tubes. The sensorshould be an open circuit when the fan is not running.

In the first step of the ignition sequence, the controllerchecks to see that the sensor is an open circuit before thedraft fan is turned on. (In the second step, the controllerturns the fan on and confirms that the vacuum sensorcloses.)

If the vacuum sensor is closed (has continuity) before thedraft fan is turned on, and remains closed for 30 seconds,an E-20 A error is activated. (If the sensor is initially closedbut opens up within 30 seconds, the controller proceeds tostep 2 of the ignition sequence.)

The E-20 A error will remain until the user presses a buttonto acknowledge it, or until the fryer is turned off.

If the user simply presses a button to acknowledge theerror, the error message will vanish and the controller willprompt "PRESS 'TIMER' TO RETRY". The controller willnot attempt the gas ignition again until the user presses aTimer button, at which point the ignition sequence isrestarted.

E-20A Possible Causes:1. Defective vacuum sensor, or wiring or connections

shorted together.

2. Fault in blower wiring or blower relay on I/O board suchthat the blower is running even when the controllerwants it off. The blower normally does not begin to rununtil step 2 of the ignition sequence.

3. Fault in the 14-pin harness connecting the CPU boardand the I/O board, such that the digital inputs from theI/O board cannot be read reliably.



E-20 B "E-20 B *FAILURE* ""E-20 B DRAFT FAN "


Vacuum Sensor Contacts Do Not Close After FanOutput is Turned On.The E-20 B error is generated when the controller turns thedraft fan output on but does not get confirmation from thevacuum sensor that the fan is running and drawing air.

The vacuum sensor is one of the series-connected 24 VACinterlock circuits. Wiring from the I/O board monitors thecontinuity of the vacuum sensor by sending 24 VAC out onone wire leading to the sensor and checking to see if24 VAC is returning on the other wire.

When functioning correctly, the vacuum sensor shouldprovide continuity only when the draft fan is running anddrawing air through the heat exchanger tubes.

In the first step of the ignition sequence, the controllerconfirms that the sensor is open circuit before the draft fanis turned on. In the second step, the controller turns thefan on and confirms that the vacuum sensor closes.

If the vacuum sensor does not close within 30 secondsafter the controller turns the fan output on, an E-20 B erroris activated.

The E-20B error will remain until the user presses a buttonto acknowledge it, or until the fryer is turned off.

If the user simply presses a button to acknowledge theerror, the error message will vanish and the controller willprompt "PRESS 'TIMER' TO RETRY". The controller willnot attempt the gas ignition again until the user presses aTimer button, at which point the ignition sequence isrestarted.

E-20B Possible Causes:1. If blower is not running: Fault in blower, wiring, or

blower relay on I/O board such that the blower does notturn on as expected.

2. If blower is running: defective vacuum sensor; faulty,pinched, or disconnected vacuum hose; or faulty wiringor connections to the vacuum sensor.

3. Low line voltage or wrong voltage blower, such thatblower does not run fast enough to draw sufficient air.

4. Faulty opto-coupler chip on the I/O board.



E-20 C "E-20 C *FAILURE* ""E-20 C IGN MOD ""E-20 C NO "PV" "


Ignition Module is Not Responding.The E-20 C error is generated during the fourth step of theignition sequence if the controller turns the ignition moduleon but does not see the ignition module in turn activate its"PV" Pilot Valve output. Lack of a PV signal indicates thatthe ignition module is either locked out (after repeated lossof its flame sense signal) or is not functioning correctly.

Normally, the controller turns the ignition module on at thestart of step 4 of the ignition sequence -- just aftercompleting the 30-second purge delay. When functioningcorrectly, the ignition module should turn its PV Pilot Valveoutput on and begin sparking within a few seconds.

If the controller does not detect the ignition module's PVsignal within 30 seconds after turning the ignition moduleon, an E-20 C error is activated.

The E-20C error will remain until the user presses a buttonto acknowledge it, or until the fryer is turned off. As withother E-20 errors, the "PRESS 'TIMER' TO RETRY"prompt is presented after the error is acknowledged.

If the fryer is easily able to re-ignite after an E-20C error iscleared, it is likely that the module was simply "locked out"due to repeated loss of its flame sense signal.

Most of the time, the pilot flame itself is not actually lost --just the sensing of it. This can be due to a bad flame senserod or connection or can be due to a low pilot flame. It canalso be due to a pilot flame that is blown around (awayfrom the sensing rod) by any of a number of causes: fryerlocated near drive-through window on a windy day; userclosing the doors under the fryer too quickly; fan blowing onfloor near fryer to dry the floor after mopping; etc.

E-20C Possible Causes:1. Ignition Module was "locked out" after losing flame

sense four times. As a safety precaution, the modulewill refuse to light after a certain number of "loss of pilotflame" events. After the E-20 code, the controller turnsthe ignition module off and back on, which resets themodule's counts and enables ignition again.

2. If E-20C occurs repeatedly and the ignition modulenever even tries to spark, there could be a problemwith the module, the wiring to the module, or theignition module relay on the I/O board, etc.

3. If module does begin sparking but controller staysstuck on Ign Seq step 4: faulty "PV" opto-coupler chipon the I/O board. (Ign Seq should go on to step 5 oncethe module begins sparking.)



E-20 D "E-20 D NO FLAME ""E-20 D ""E-20 D CHECK ""E-20 D GAS VALVE"


Unable to Light the Pilot Flame.The E-20 D error is generated during the fifth step of theignition sequence if the controller sees the ignition moduletrying to light the pilot flame but the pilot flame is notestablished within the allotted time.

The controller turns the ignition module on at step 4 of theignition sequence. When functioning correctly, the ignitionmodule should turn its "PV" Pilot Valve output on and beginsparking within a few seconds.

When the controller sees the module has its PV output on(pilot valve energized), the controller immediately advancesto step 5 of the ignition sequence: waiting for the pilot flameto be detected.

Once the pilot flame is lighted and is detected by themodule's flame sense rod, the module stops sparking andturns on its "MV" Main Valve output. When the controllersees the MV signal, it knows the pilot flame has beenignited successfully and that the ignition sequence iscomplete.

If the controller does not detect the module's MV signal(indicating the pilot flame is lighted) within 60 seconds afterthe ignition module turns its PV output on, an E-20 D erroris activated. This indicates that pilot ignition was attemptedfor 60 seconds but no pilot flame was detected.

The E-20D error will remain until the user presses a buttonto acknowledge it, or until the fryer is turned off. As withother E-20 errors, the "PRESS 'TIMER' TO RETRY"prompt is presented after the error is acknowledged.

E-20D Possible Causes:1. Manual gas valve knob in "Off" position, gas supply line

disconnected, or still purging air from the gas line.

2. Faulty gas valve solenoid, or problem with wiring.(On Ignition Sequence step 4, should see 24 VACbetween "P" and "C" terminals at gas valve.)

3. If flame lights but module keeps sparking and 24 VACnever appears at MV output of ign module: faulty flamesense rod or flame sense rod not positioned correctly;problem with flame sense wire or ground wire; pilotflame too low to be sensed. (Rare possibility: faultyignition module.)

4. If flame actually lights and 24 VAC does appear at MVoutput of ignition module, but controller stuck on IgnSeq step 5: faulty "MV" opto-coupler chip on I/O board.



E-25 "E-25 HEAT AMPS ""E-25 WERE ""E-25 TOO HIGH ""E-25 37 49 49 "

Electric Fryer Only:

Heat Amps (Current Draw) Too HighThe E-25 "Amps Too High" error is activated if theamperage reading (electrical current) for any of the threeamps sensors exceeds the CFA-27 "MAX ACCEPT.AMPS" setting (when the heat output is on).

The Min and Max amps limits are set automatically whenthe "Fryer Supply Volts" setting (step T-11) is programmedin Tech Mode.

To view the Min and Max amps limits, activate Info Modeby pressing INFO and PROG at the same time, then pressINFO once to circle around to the Amps display on the laststep. Press the DOWN button to view the Low Limit.Press DOWN a second time to view the High Limit.

Typically, this error would result from a wrong wattage orwrong voltage element, or some other wiring problem. Itmight also result from excessively high voltage -- as whenrunning a 208 V fryer on 240 V.

By the time the warning message is displayed the controllerhas already turned the heat off (due to the Error Code).The amps values shown in the error message are "latched"copies of the amps readings that triggered the error.

NOTE: To clear this Error you MUST turn the powerswitch off and back on!

E-25 Possible Causes:

1. Wrong "Fryer Supply Volts" setting. The controller setsthe Min and Max Amps Limits based on theprogrammed Voltage setting. Check Tech Mode stepT-11 and confirm the nominal voltage is set correctly.

2. Wrong wattage heating element installed.

3. Wiring problem, such that one or more supply legsends up feeding more heating coils than normal.

4. Fryer voltage excessively high (compared to fryer'snominal design voltage).


Note: All Amps errors can be disabled by simplyunplugging the transducer harness. Do this ONLY if youare absolutely certain that the problem is due to a defectivecurrent transducer assembly and not a fault in the fryer.



E-26 "E-26 HEAT AMPS ""E-26 ARE ""E-26 LOCKED ON ""E-26 37 37 37 "

Electric Fryer Only:

Heat Amps Locked On (Controller can't turn heat off)The E-26 "Amps Locked On" error is activated if theamperage reading (electrical current) for any of the threeamps sensors exceeds a hard-coded limit of 4 amps whenthe heat output is off.

This error essentially signals that the controller is trying toturn the heat off but the amps sensors indicate that one ormore legs is still drawing significant current.

NOTE: This is one of the few error codes that will bedisplayed even with the power switch off, if the faultcondition persists! If turning the power switch off doesnot shut down the current flow then the user must unplugthe fryer or shut off a breaker to the fryer.

E-26 Possible Causes:1. One or both contactors with contacts "welded on".

2. Controller output(s) to relay coil(s) shorted "on"(contactors okay but 24vac on/off signal from controlleris stuck on).


Note: All Amps errors can be disabled by simplyunplugging the transducer harness. Do this ONLY if youare absolutely certain that the problem is due to a defectivecurrent transducer assembly and not a fault in the fryer.



E-41 System settings lost:(Special Prog settings,CFA Prog settings, etc.)

"E-41 SYSTEM ""E-41 DATA ""E-41 LOST "

Product settings lost:(Product numberidentified on first line)

"E-41 -1- ""E-41 DATA ""E-41 LOST "

Note: Each product ismanaged individually,so a loss of all sixproduct settings wouldresult in six differentE-41 errors.

Also, loss of a singleproduct would result injust that product beingre-initialized, leavingthe other five productsintact.

Programmed Settings Lost.This error indicates that some problem caused memory tobe scrambled and resulted in the loss of programmedsettings. By the time this error appears in the display, thesettings in question will have already been reset to factorydefault values.

The error will persist until the user acknowledges it bypressing any button, or until the power switch is turned offand back on.

Normal heating will continue even while the E-41 errorcode is being signaled, as the error message occurs afterthe fact: the settings are fixed automatically as soon as theproblem is detected, and then the error code is started.

This error should be very rare. All programmed settingsare stored in two locations, so if one location gets wipedout the controller can generally restore it from the otherlocation. It is only when both locations get wiped out at thesame time that an E-41 occurs.

However, E-41 errors can be expected if new software isinstalled into an old controller board, and the controller isnot properly re-initialized via Mfg. mode. If the newersoftware has additional product settings or system settings,the old settings stored in the controller won't properlymatch up to the new software's settings. In this case, oneor more E-41's may be signaled on the first power up.However, the controller automatically initializes theappropriate settings to factory defaults when an E-41 isdetected, so simply powering down again and powering upa second time should clear all the E-41 codes.

E-41 Possible Causes:1. Extreme voltage spikes or dropouts on power supply or

line voltage supply.

2. Installation of new software, as described above.

3. Moisture or contamination on the controller board, orother defect affecting the EEPROM and PSD memorychips.



E-46 "E-46 DATA ""E-46 SAVE ""E-46 FAILED"

EEPROM Memory Write Error.This error is generated when the controller attempts towrite to the EEPROM memory chip -- to save programsettings or statistics data -- and the write operation fails.

The EEPROM chip is a "permanent storage" device, whereprogram settings may be stored for indefinite periods oftime, even if the fryer is turned off or unplugged.

Each time the controller writes something to the EEPROMchip, it immediately reads back the information to confirmthat the chip received it and saved it correctly. If for somereason the data was not saved correctly, the controller willautomatically try a second time, and even a third time. Ifthe operation still fails on the third attempt, an E-46 error issignaled.

The E-46 error will persist until the user acknowledges it bypressing any button, or until the power switch is turned offand back on.

Normal heating will continue even while the E-46 errorcode is being signaled. Fryer operation might still bepossible with a failed EEPROM, as the controller may stillbe able to operate with a RAM copy of the settings.

However, E-46 errors are likely to pop up repeatedly, eachtime the controller tries to save statistics data to theEEPROM (about every two hours), or tries to save newsystem or product settings.

E-46 Possible Causes:1. Failed EEPROM chip, or problems with related solder

joints or traces on the circuit board.

2. Moisture or contamination on the controller boardaffecting the EEPROM chip.



E-70 A "E-70 A FAN VAC ""E-70 A JUMPER ""E-70 A MISSING "

Pressure Fryer Only:

Fan Vacuum Jumper MissingThe CFA Pressure Fryers do not have a vacuum switch,but instead require a wire jumper to complete the interlockcircuit. Th E-70A error is generated when the controllerobserves that the wire is missing.

Pressure Fryer:The 6-pin wiring harness with the Drain and High Limitconnections should have a small loop of wire between pins1 and 2, shorting across the "Vacuum Switch" inputs.Without this wire, the controller cannot turn the heatingcircuits on.

Note: If the connector is simply not plugged onto thecontroller, an E-10 High Limit error will be reported. HighLimit (E-10) and Drain Open (E-15) errors are both higherpriority and would be reported before an E-70A is reported.

Open Fryer:This error is not possible on CFA Open Fryers. Gas OpenFryers do have vacuum switches. Electric Open Fryersrequire a jumper, just like the pressure fryers. However,the loss or failure of this jumper on an Electric Open Fryerwill result in the fryer falsely auto-detecting as a Gas fryer.

E-70 A Possible Causes:1. Missing or broken wire in pins 1 and 2 of I/O board P11

connector (High Limit and Drain connector), or faultyconnector.

2. Failure of one of the opto-couplers (on the I/O board)that monitors the power switch signals. Try replacingthe I/O board.



E-70 B "E-70 B PWR SW ""E-70 B OR WIRES""E-70 B FAILED "

Power Switch Failure or Wiring Error.This error is generated when the controller observes thatthe connections to the power switch do not operate asexpected.

The Power Switch on the CFA fryers is actually wired with24 VAC -- not line voltage. The controller stays poweredregardless of which position the power switch is in.

Pressure Fryer:One set of contacts (double throw) lets the controller knowwhether the switch is in the Cook (On), Off, or Pumppositions. The other side of the switch is part of the series-wired 24 VAC interlock circuit.

Open Fryer:One pair of contacts lets the controller know whether theswitch is in the On or Off position. The other side of theswitch is part of the series-wired 24 VAC interlock circuit.(The pump in Open Fryers is common to both wells and isnot monitored by the controller.)

Normally, the controller should see the signal from thepower switch interlock contacts at the same time it sees thepower switch is in the On (Cook) position. If it sees theswitch is On but does not see the interlock signal, or if itsees the interlock signal but does not see the switch is On,then it generates an E-70B error.

On pressure fryers, this error can result if the wires for theinterlock are placed on the upper two terminals instead ofthe lower two terminals. It can also result if the Pump andCook wires are swapped.

On either fryer, this error can result if any of the wires aredisconnected, or if the switch itself has failed.

The error will disappear only if the wiring error is fixed, or ifthe power switch is changed to a position that does behaveas expected.

E-70 B Possible Causes:1. Power switch wired incorrectly.

2. Power switch failure / bad contacts.

3. Failure of one of the opto-couplers (on the I/O board)that monitors the power switch signals. Try replacingthe I/O board.



E-92 "E-92 24 VOLT ""E-92 FUSE "

24 Volt Fuse BlownE-92 is generated when the controller detects that no 24Volt AC signal is present at the start of the interlock chain.

The fryer controller is equipped with a 24 VAC currentlimiting device, which acts like a small, self-resetting circuitbreaker. The current limiter ("fuse") is the very first testpoint in the entire interlock chain. 24 VAC should alwaysbe detected there --whether or not the power switch is on,whether or not the high limit and drain are closed, etc.Failure to detect 24 VAC normally means that the currentlimiter has been tripped.

If indeed the limiter has been tripped, look for places whereany of the interlock connections may be shorted to the fryersheet metal. A short to chassis ground is the most likelycause of a tripped 24 VAC current limiter.

Check the drain microswitch by removing the back coverfrom the mounting bracket. Check to see if the switch itselfis broken, if any wires have come off or have been cut, or ifany terminals might be shorting to the sheet metal. Insome cases, a loose screw or nut has fallen into thehousing and created a short to ground.

Check all 24 VAC connections and devices: the wiring tothe high limit, drain switch, power switch, heat contactors,and pressure solenoid, etc. Look for wires that may bepulled tight against sharp sheet metal edges.

Note that a false E-92 can result from the failure of the14-pin cable that connects the CPU board and the I/Oboard. When this cable is damaged or unplugged, none ofthe interlock signals can be detected by the controllerboard (or the signals are detected intermittently). Since the24 VAC fuse is the first test point in the chain, an E-92 errorwill be generated. (If the connection is intermittent, othererrors like E-10 and E-15 may also occur.)

E-92 Possible Causes:1. 24 VAC current limiter on I/O board is tripped, due to

wire or terminal shorting to sheet metal ground.2. 24 VAC current limiter on I/O board is tripped, due to

current overdraw to a bad component like a shortedsolenoid coil or a shorted contactor coil.

3. Damaged or unconnected 14-pin cable between theCPU board and the I/O board.

4. Failed opto-coupler chip on I/O board, or bad trace orsolder connections. If Info Mode Digital Inputs displayshows "_HD", possibly with an intermittent "V" beforethe "H", then the opto may be bad. Replace the I/Oboard, but only if the "H" is shown when the "V" is not.

5. Moisture or contamination on the controller board or I/Oboard affecting the shift register or opto-couplers.

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