LG Dishwasher Error Code 4C5

The 4C5 code indicates a no water supply condition on LG dishwashers with software version 7134 or later. The control board attempts to open the water inlet valve three times, cycling it on for 60 seconds and off for 3 seconds each time. If water is not detected after all three attempts, the dishwasher stops and displays 4C5. The most likely causes are a closed shutoff valve, a kinked supply hose, or a faulty inlet valve.

A reset may clear the displayed code temporarily, but the 4C5 error will return if the underlying water supply issue has not been fixed. To reset, press and hold the power button for a few seconds or disconnect power to the unit briefly. Always resolve the water supply problem before running the dishwasher again to avoid repeated faults.

If the fix is simply opening a shutoff valve or straightening a kinked hose, there is no parts cost involved. Cleaning a clogged inlet valve screen is also a low-cost repair. If the water inlet valve solenoid has failed and needs replacement, parts typically range from $20 to $60 depending on the model, with professional labor adding $75 to $150 or more depending on your location and service provider.

Start by confirming the water shutoff valve under the sink is fully open and the supply hose has no kinks. Next, check the inlet valve filter screen for sediment blockage and clean it if necessary. If the supply conditions are normal, test the water inlet valve solenoid coil for continuity and replace the valve if it has failed. Restoring proper water flow will clear the condition on the next cycle.

The dishwasher will not complete a wash cycle while the 4C5 code is active because it halts operation when it cannot confirm adequate water supply. Running the unit without resolving the water supply issue will not cause immediate safety hazards, but wash and dry performance will be absent. Address the supply fault before attempting further use.