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Error code reference
LG Refrigerator Error Code R1 R2 R3 R4
Faulty R sensor - The refrigerator sensor is open or short circuited, compressor cycles 15 min ON / 15 min OFF.
SourceLG Electronic Refrigerator - Service Manual: G392/G432 Seriesp. 18
Diagnostic procedure
The full R1 R2 R3 R4 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 refrigerator sensor resistance and voltage at Point A (normal 0.5V-4.5V, short-circuited 0V, open 5V). Replace sensor if faulty.
SourceLG Electronic Refrigerator - Service Manual: G392/G432 Seriesp. 18
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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