Error code reference
LG Dishwasher Error Code E4
Overflow switch is kept ON for 2 seconds during power-on; has priority over other errors
Overflow switch is kept ON for 2 seconds during power-on; has priority over other errors. Floater in overflow sensor presses the micro switch.
First step from the service manual
Check the connections for the leakage switch 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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