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Error code reference
LG Refrigerator Error Code F2+F4
Poor defrosting at upper compartment - defrosting sensor did not reach above 7°C (16°C for GR-J213) within 2 hours after starting defrost.
SourceLG Refrigerator - Full Service Manual: GR-J Series (GR-J213/J303/J323/J403/J408)p. 14-15
Diagnostic procedure
The full F2+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 temperature fuse, heater continuity, drain for clogging, and heater driving relay.
SourceLG Refrigerator - Full Service Manual: GR-J Series (GR-J213/J303/J323/J403/J408)p. 14-15
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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