Error code reference

LG Refrigerator Error Code R1 R2 R3 R4 (blinking pattern 3)

Defrost problem - Defrost time exceeded 2 hours and evaporator temperature did not reach 13°C.

SourceLG Electronic Refrigerator - Service Manual: G392/G432 Seriesp. 18

Diagnostic procedure

The full R1 R2 R3 R4 (blinking pattern 3) 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 defrost heater, defrost sensor, thermal fuse, and heater relay (RY5 on Main PWB).

SourceLG Electronic Refrigerator - Service Manual: G392/G432 Seriesp. 18

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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

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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The full R1 R2 R3 R4 (blinking pattern 3) procedure

Where this code is documented

Models covered by the manuals that document this code

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