Error code reference

Samsung Washer Error Code Warm LED Flash

Communication Code - signals between the sub and main PBAs are not sensed due to communication error, incorrect or loose connector connections between sub and main PBAs, or faulty soldering on sub PBA.

SourceSamsung Top-Load Washer - Service Manual: WA40J3000A Seriesp. 19, 22

Diagnostic procedure

The full Warm LED Flash 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 the wire connections and terminal contacts between the sub and main PBAs and check for disconnected wires.

SourceSamsung Top-Load Washer - Service Manual: WA40J3000A Seriesp. 19, 22

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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