Error code reference

LG Microwave Error Code F-9

Fault related to inverter module, magnetron, relay, or unsafe AC input voltage: oven does not cook despite display showing set figures and START pad being touched.

SourceLG Microwave Hood Combination - Service Manual (721.63762-69)p. 7-23

LG codes LG microwave codes

Diagnostic procedure

The full F-9 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 the connection between magnetron, door & control PCB and inverter module.

SourceLG Microwave Hood Combination - Service Manual (721.63762-69)p. 7-23

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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

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

Models covered by the manuals that document this code

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The full F-9 procedure

Where this code is documented

Models covered by the manuals that document this code

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