Error code reference

LG Dishwasher Error Code AC

Inverter PBA communication error

Inverter PBA communication error - no response received from inverter PBA for 3 seconds, relay off for 3 minutes, repeated 3 times before displaying check code.

First step from the service manual

Check communications connection between main PBA and inverter PBA.

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

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Step-by-step tests with expected resistance, voltage, and continuity values
Wiring diagram references and connector pinouts from the OEM service manual
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AC on my LG LDP6797ST

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Inverter PBA communication error - no response

From Service Manual 585929, p.21:

1.Check communications connection between main PBA and inverter 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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First step from the service manual

Get the full diagnostic procedure for AC.

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