When an oven with an electronic control fails, it usually signals the failure with an F code.
These F codes are considered by many people to be an indicator as to positively which part in the circuit has failed (F1 a defective control, F3 a defective oven probe, and so on). To the embarrassment of many servicemen who have believed this, they have installed the indicated part only to find it did not correct the problem.
To troubleshoot an oven with an electronic oven control that is not operating:1
. Make sure electrical power is being supply to the control.2
. Disconnect power for 30 seconds. If fault returns when power is reconnected continue with the
. Go to the back of the control and disconnect the multi-pin plug.4
. Check the wiring diagram to determine which two pins in the plug (not on the EOC) are connected to the oven sensor.5
. With an Ohmmeter check the resistance between the two pins in the plug that are connected to the sensor. At room temperature:STEP 1
: If the meter reads below 900 Ohms or above 1200 Ohms, remove the sensor from the oven and check it for resistance. If the resistance of the sensor is the same as reading at the plug, the sensor is defective. If the resistance of the sensor reads between 900 & 1200, the wiring between the control and the sensor is defective.STEP 2
: If the meter reads between 900 Ohms & 1200 Ohms check the resistance between one of the pins going to the sensor and chassis. If the meter reads infinity go to step 3. If the meter shows continuity, remove the sensor and check from one of its pins to the case of the sensor. If the meter reads continuity, the sensor is defective. If the meter reads infinity, the wiring between the control and the sensor is shorted to chassis of the range.STEP 3
: From the wiring diagram, determine which 3 wires if automatic lock or which 2 wires if manual lock, in the plug is from the door lock switch or switches. From the diagram determine which of the switches are open or closed when the door in the unlocked position. With an Ohmmeter check to see if the switch that is shown open is open and the switch that is shown closed is closed by checking the proper pins in the plug.6
. If the above checks test good and the relay on the board for the selected function is not closing replace the control.IMPORTANT
: If the oven problem is intermittent you must do the above test when the oven is malfunctioning.DISPLAYED FAULT CONDITIONSIMPORTANT NOTE: Not all EOCs will display every fault code listed. Some of the F-codes are foundonly on older products. For example: F3 on current models can be an open or shorted probe andthey will not display an F4, but on some older models F3 indicates an open probe and F4 indicates ashorted probe.F1Control FailureShorted keypad. Internal checksum may have corrupted control relay shorted or bad probe.Check probe and probe wiring and replace if bad. Power off for 30 seconds. If fault returns replacecontrolF2Oven temperature above specifications:The oven temp has risen above 665 degrees F and the oven door is not locked or : the oven temphas risen above 965 degrees F with the door locked.TEST: Door latch switch or switches; oven sensor (RTD); Electronic oven control (EOC)F3The RTD is open/shortedCheck for open wiring connections between EOC and RTD. Check resistance of RTD using resistancetable. If resistance test is correct and wiring is good to board replace EOC.F4Shorted oven sensor (RTD)Check for shorted wiring between EOC and RTD. Check resistance of RTD using resistance table. Ifresistance test is correct and wiring is good replace EOC.F5The watchdog circuit is active when it should be disabled.The microprocessor checked for operation of EOC relay after selection of Bake, Broil, or Clean operationand relay failed test. Check for shorted keypad or pushbuttons binding in glass and stuck. If notreplace EOC.F6No 60 Hz baseTime base is required for time controlled cycling. Replace EOC.F7Lock motor relay watchdog circuit active when it should be disabled.The microprocessor checked for operation of the EOC lock relay after selection, and the relay failedthe test. Replace EOCF8/F9Lock motor switches improperly positioned. The microprocessor has found the lock motor switchesto be out of sequence or shorted. Test switches and if found to be good and in proper sequencethen replace EOC.* Fault Code Index