Microwaves

Cavity thermistor open

The cavity temperature sensor reads open. Some repair sites list F1 as a touchpad fault instead; confirm with the tech sheet.

Cavity thermistor shorted

The cavity temperature sensor reads shorted. Some sites describe F2 as an over-temperature shutdown; confirm with the tech sheet.

Shorted key panel

The control detects a shorted key panel continuously for over about 60 seconds.

Exhaust fan error

The exhaust (vent) fan does not run or reach speed when called.

Thermistor out of range

LG describes F2 as a thermistor problem putting the temperature out of range. Third-party sites give different meanings, so confirm on the model.

Control panel / shorted key

LG lists F3 as a control panel problem; other sources specify a key panel shorted for more than about 60 seconds.

Humidity sensor error

The humidity sensor failed its self-check during sensor cooking.

Damper switch error (per LG)

LG lists F5 as a damper switch error; a repair database lists a cavity over-temperature meaning. Confirm on the model's tech sheet.

Inverter communication error

The control lost communication with the inverter board.

Key short error

A key reads as shorted after about 10 seconds.

Fault - stop using

Panasonic lists E01 as a fault: stop using the unit, unplug it and contact authorized service.

No microwave oscillation (magnetron/inverter)

Self-diagnosis found no microwave output after Start: magnetron or inverter circuit fault. Stop using and service.

High-voltage protection fault

Reported as a high-voltage protection stop; the oven stops heating. Panasonic lists the code without detail.

Microwave generation fault

Grouped with H98 by one source as a fault in the microwave-generating system. Panasonic lists it without a description.

No microwave output detected (inverter/magnetron)

The self-check found no microwave generation after Start. Points to the inverter board, magnetron or the power feed to them.

Magnetron / inverter circuit failure

No microwave oscillation detected after Start; one source says unplugging does not clear it.

Cavity too hot for auto programs

Not a fault: the cavity is still hot from earlier use, so auto/sensor programs are locked out. Manual time and power still work.

Cavity too hot

The cavity is overheated, or room temperature is above the proofing temperature. Not a hardware fault.

Cooking sensor information code

Information-code form of a vapor/easy/pH sensor fault on newer displays.

Temperature sensor open or shorted

The temperature sensor reads open (E-21) or shorted (E-22).

Over-temperature during cooking

Internal temperature rose above the limit during a cooking mode (fire/overheat sensed).

Steam sensor error

Steam sensor fault; E-71 is open and E-72 is shorted.

Damper not detected

The vent damper was not detected opening or closing for about one minute.

Board communication fault

The main and sub control boards are not communicating.

Touch panel communication fault

Abnormal communication between the touch keys and the control.

Door open fault

The control sees the door as open.

Cook time over the limit

The entered cooking time exceeds the limit for the mode (microwave, grill, convection, combination or heater). Not a hardware fault.

Vapor (gas) sensor open

The cooking-vapor sensor reads open. 'Gas' means cooking vapor, not fuel gas.

Vapor (gas) sensor shorted

The cooking-vapor sensor circuit reads shorted.

Vapor sensor timed out

The vapor sensor did not detect the expected change within its maximum time during a sensor program.

Dry or no-load sensor error

The sensor program detected an empty or dried-out cavity (no load).

Temperature step took too long (preheat)

The temperature sensor stage exceeded its maximum time, typically during convection preheat.

Abnormal temperature in microwave mode

The temperature reading during microwave cooking was out of the normal range.

Temperature not rising in heater mode

During grill/convection heating the temperature did not climb past the expected threshold.

Weight sensor errors

Weight-sensing auto programs read under-weight, over-weight or an invalid weight.

Door opened during sensing

The door was opened while a sensor program was measuring.

Easy/pH sensor open or shorted

The auxiliary 'easy/pH' sensor circuit reads open (E-41) or shorted (E-42).

Easy/pH sensor dry-up

The easy/pH sensor detected a dried-out or empty condition.

Memory (EEPROM) errors

The control's memory reported a sense, read/write or zero-setting error.

Humidity sensor open, shorted or timed out

Humidity sensor reads open (E-61), shorted (E-62) or did not respond in time (E-63).

Key short / key held too long

A touch key reads as pressed for more than about 10 seconds, usually from water, grease or a failing touch panel.

Sensor cooking error (humidity sensor)

Shown during sensor cooking when the humidity sensor reading is not valid.

AccuPop function could not run

The control could not complete the AccuPop popcorn program, possibly from its sensor.

Door closed 5+ minutes without a start

Not a fault: the door stayed closed 5 minutes or more without a cycle, so the oven asks you to open and close it before starting.

Keypad reported a problem

The keypad (user interface) reported a fault to the control board on models that use E-series codes.

Cooking vapor (gas) sensor fault

The food-vapor sensor used for sensor cooking reported a problem. 'Gas' here means cooking vapors, not a fuel-gas leak.

Cooking vapor (gas) sensor circuit fault

Second vapor-sensor code: the sensor or its wiring is not reading correctly.

Oven did not preheat

On convection models the cavity did not reach preheat temperature in the expected time.

Thermal sensor open

The thermal sensor circuit reads open at the control board.

Thermal sensor shorted

The thermal sensor circuit reads shorted at the control board.

Overheat limit reached

The unit detected an overheat condition (about 500 °F / 260 °C) and stopped. Stop using it until the cause is found.

Oven sensor open

The oven temperature sensor circuit reads open.

Oven sensor shorted

The oven temperature sensor circuit reads shorted.

Could not execute function (relay control)

The microwave could not carry out the requested function; Whirlpool points to the relay control board or its wiring.

Could not execute function

Listed alongside F1E1 as an 'unable to execute the function' control fault.

Keypad (user interface) fault

The control board has flagged the keypad or the wiring between keypad and control.

Cavity temperature thermistor fault

Problem with the cavity temperature thermistor or its wiring.

Magnetron temperature thermistor fault

The thermistor that watches magnetron temperature, or its wiring, has a problem.

Cavity temperature thermistor fault (alternate code)

Same circuit as F3C on models using the F4 code family: cavity thermistor or its wiring.