Error code reference

LG Dishwasher Error Code bC3

Communications between the main PBA and the sub PBA fails for 24 seconds (or 4 seconds in Test Mode).

First step from the service manual

Check communications connection between main PBA and sub PBA.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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bC3 on my LG LDP6797ST

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Communications between the main PBA and the sub

From Service Manual 922595, p.47:

1.Check communications connection between main PBA and sub PBA.

2.Inspect the communication harness between the main control and the UI board for bent pins or unseated connectors at each end.

3.Measure supply voltage to the UI board. Expected: 5 VDC at the interface connector; a low or missing rail points back to the main control supply.

Part EBR73304220

Display PCB assembly

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