Error code reference

LG Microwave Error Code F-1

Toaster heater or thermistor fault: indicates defective heater, defective thermistor, or loose connection at CN3 connector.

SourceLG LTM9020 Microwave Oven - Full Service Manualp. 31

LG codes LG microwave codes

Diagnostic procedure

The full F-1 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview

First diagnostic step

Check continuity of thermistor, then check continuity of heater, then check the connection between CN3 connector and PCB assembly.

SourceLG LTM9020 Microwave Oven - Full Service Manualp. 31

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More steps, wiring diagram references, and verified part numbers

Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.

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Where this code is documented

29 manuals in the MyPros+ library document this code for LG microwave.

Models covered by the manuals that document this code

More models are covered than are listed here.

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The full F-1 procedure

Where this code is documented

Models covered by the manuals that document this code

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