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Error code reference
LG Refrigerator Error Code F3 F4
Faulty defrost - defrost heater and temperature fuse are cut and disconnected (indicates after at least four hours when troubles occur).
SourceLG Refrigerator - Service Manual: GR-L197 Seriesp. 36
Diagnostic procedure
The full F3 F4 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
1
First diagnostic step
Check defrost heater continuity and temperature fuse.
SourceLG Refrigerator - Service Manual: GR-L197 Seriesp. 36
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
1 manual in the MyPros+ library documents this code for LG refrigerator.
Models covered by the manuals that document this code
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