Error code reference

LG Dishwasher Error Code 4C

Water supply error

Water supply error - water supply pulses less than 10 within 20 seconds after water is supplied, or target water level not reached within 60 minutes.

First step from the service manual

Check if water supply valve is open and water pressure is adequate.

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

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4C on my LG LDP6797ST

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Water supply error - water supply pulses less

From Service Manual 586332, p.24:

1.Check if water supply valve is open and water pressure is adequate.

2.Measure the inlet valve coil resistance at the valve connector. Expected: 1,000 to 1,200 ohms per coil at room temperature.

3.Verify static water supply pressure at the inlet hose. Below 20 psi or fluctuating supply commonly triggers fill-timeout faults.

Part 5220FR2006H

Water inlet valve

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