LG Dishwasher Error Code 4C

The 4C error code on an LG dishwasher means the appliance is not receiving enough water. The control board triggers this code when the flow sensor counts fewer than 10 water pulses in the first 20 seconds of filling, or when the dishwasher cannot reach its target water level within 60 minutes. It is a water supply error that stops the cycle to protect the machine.

Resetting the dishwasher by pressing and holding the power button or disconnecting power for a few minutes may clear the code temporarily, but it will return if the underlying cause is not addressed. The 4C error is triggered by a real supply condition, so the water flow issue must be resolved before the machine can complete a cycle successfully.

Repair costs depend on the root cause. If the fix is simply opening a valve or straightening a hose, there is no parts cost. Replacing a water inlet valve typically runs in the range of $30 to $80 for the part, plus labor if a technician is involved. A flow sensor replacement is a similar cost range. Total repair costs including professional labor generally fall between $100 and $250, depending on your location and the parts required.

Start by confirming the water supply valve under the sink is fully open and that your home has adequate water pressure. Check the supply hose for kinks or obstructions. If those are fine, inspect and clean the inlet valve screen filter for mineral buildup or debris. If the problem persists after those checks, the water inlet valve or flow sensor may need to be tested and replaced.

You should not attempt to run the dishwasher while the 4C error is active. The code indicates the appliance is not receiving enough water to operate correctly, and running it in this state could damage the pump or heating element. Resolve the water supply issue before restarting the dishwasher.