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Error code reference
Whirlpool Refrigerator Error Code 4 pulses
Optics status LED output: The relay is defective on the ice maker emitter/receiver boards.
Diagnostic procedure
The full 4 pulses 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
Replace both the emitter and receiver boards.
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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