Error code reference

LG Washer Error Code C4

Water supply check

Water supply check - cold and warm water supply hoses wrongly engaged, water temperature sensed higher than 60°C during dry cycle via dry valve, or water temperature sensed higher than 60°C in Wool or Lingerie courses.

First step from the service manual

Check if cold and warm water supply hoses are correctly connected.

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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