Error code reference
LG Dishwasher Error Code AC2
No response from inverter PBA for 3 seconds (S/W ver
No response from inverter PBA for 3 seconds (S/W ver. 7134+); inverter Relay 1 min off, retries until finding response.
First step from the service manual
Check the connections between Main PBA CN1 connector and Inverter PBA CN1 connector.
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
- Verified part numbers when replacement is required
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