Error code reference

LG Washer Error Code 4C

Water supply error

Water supply error - foreign material entering water supply valve, valve terminal not connected, warm and rinse connectors wrongly connected, PCB terminal from drain hose to detergent drawer not connected, or transparent hose folded/torn.

First step from the service manual

Check for foreign material in the water supply valve and verify valve terminal connections.

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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