Oven cavity thermistor open — thermistor does not read 165°F or greater after 20 minutes of Oven/Bake or Speedcook operation.
First step from the service manual
1
Check if a large cold load was being cooked (thermistor may not reach 165°F in 20 minutes); otherwise test thermistor resistance at connector CN6 on main PCB.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
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Oven cavity thermistor open — thermistor does
From Service Manual 739271, p.43:
1.Check if a large cold load was being cooked (thermistor may not reach 165°F in 20 minutes); otherwise test thermistor resistance at connector CN6 on main PCB.
2.Disconnect the sensor and measure resistance at the sensor body. Expected: 10 kΩ to 12 kΩ at 77°F (25°C).
3.Check the sensor harness for opens and shorts. Back-probe the sensor pins at the control board connector; a reading outside 5 kΩ to 50 kΩ indicates a failed sensor.
Part WR55X10025
Temperature sensor
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- FFunction error code indicated by 'F' followed by a number…
- F– and a number or letterFunction error code indicating a control or component…
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- F0-E0Default F code
- F1-E0Electronic control malfunction (E0).
- F1-E1Electronic control malfunction (E1).
- F1-E2Electronic control malfunction (E2).
- F1-E3Electronic control malfunction (E3).
- F1-E4Electronic control malfunction (E4).
- F1-E5Electronic control malfunction (E5).
- F10Upper/Single door latch switch circuit fault.
- F100Upper Machine Control processor failure.
- F101Lower Machine Control processor failure.
- F102User Interface data failure (CRC)
- F11Upper/Single door latch switch circuit fault.
- F12Lower oven door latch switch circuit fault.
- F13Lower oven door latch switch circuit fault.
- F14Machine Control upper/single door latch circuit fault.
- F15Machine Control upper/single door latch circuit fault.
- F16Machine Control lower door latch circuit fault.
- F17Machine Control lower door latch circuit fault.
- F2Double Line Break Relay is ON in a non-cooking/clean mode…
- F2-E0Keypad keytail not connected.
- F2-E1Key held down too long, or key is shorted.
- F20Upper oven sensor circuit fault
- F21Oven temperature climbed above the Error Unlock Temperature…
- F22Lower oven temperature climbed above Error Unlock…
- F23Lower oven temperature climbed above Error Lock Temperature…
- F3Open sensor or open sensor circuit; sensor lead shorted to…
- F3-E0Temperature sensor (lower) opened.
- F3-E1Temperature sensor (lower) shorted.
- F3-E2Temperature sensor (microwave) opened.
- F3-E3Temperature sensor (microwave) shorted.
- F30Upper oven sensor circuit fault related to oven sensor…
- F31Upper oven sensor circuit fault related to oven sensor…
- F32Lower oven sensor circuit fault related to oven sensor…
- F33Lower oven sensor circuit fault related to oven sensor…
- F34Upper oven calibration CRC failure or difference between…
- F35Lower oven calibration CRC failure or difference between…
- F36Machine Control upper cooling fan running too fast.
- F37Machine Control lower cooling fan running too fast.
- F4Open or shorted oven temperature sensor or sensor circuit…
- F4-E0Meat probe shorted.
- F40Upper oven meat probe circuit shorted (Machine Control…
- F41Lower oven meat probe circuit shorted (Machine Control…
- F5Control sensor circuit supervisor error
- F5-E0Lower cavity over temperature while cleaning.
- F5-E1Lower cavity over temperature during cooking.
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- F6-E0Microwave cavity over temperature during cooking.
- F6-E1Self-clean latch will not lock.
- F6-E2Self-clean latch will not unlock.
- F60Loss of communications to upper machine control (Machine…
- F61Communication loss to the upper temp encoder.
- F62Communication loss to the Upper Mode Encoder.
- F63Loss of communications to lower machine control (Machine…
- F64Communication loss to the lower temp encoder.
- F65Communication loss to the Lower Mode Encoder.
- F66Loss of communications to user interface (Machine Control…
- F7Double Line Break Relay is ON in a non-cooking/clean mode…
- F70ERC detecting a continuous keypanel press (T012 tactile) or…
- F71ERC detects continuous keypanel press (T012 tactile) or…
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- F74Glass touch input fault (T012 glass touch units).
- F75Glass touch input fault (T012 glass touch units).
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- F77Glass touch input fault (T012 glass touch units).
- F78Glass touch input fault (T012 glass touch units).
- F79Machine Control lower oven sensor fault
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- F7EGlass touch communication failure (Machine Control).
- F7FGlass Touch CRC failure or any error that GT reports in…
- F8Glass touch failure
- F8-E0Oven over temperature while door open and latch lock.
- F8-E1Oven over temperature while door open and latch unlock.
- F8-E4Oven over temperature while door closed and latch unlock.
- F80Internal electronic problem in the upper machine control or…
- F81Internal electronic problem in the lower machine control or…
- F82User interface parametric data CRC failure or RAM check…
- F9Clean FAD (Fan Apparency Device) thermal cutoff has opened…
- F90Upper oven door becomes locked while expected to be…
- F91Oven door becomes unlocked while it is expected to be…
- F92Upper oven Unlock Home and Lock Home are true…
- F93Lower oven door becomes locked while expected to be…
- F94Lower oven door becomes unlocked while expected to be…
- F95Lower oven unlock home and lock home are true…
- F96The speed of the cooling fan is below the minimum fan speed…
- F97Lower cooling fan speed is below the minimum fan speed…
- F98The speed of the cooling fan is below the minimum fan speed…
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- LOCKLock switch circuit open (flashing on display).
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