LG Dishwasher Error Code 4E5

The 4E5 code means the dishwasher has entered a no water supply mode, where the control board cannot detect expected water supply pulses during the fill cycle. The unit automatically attempts to correct this by cycling the water inlet valve on for 60 seconds and off for 3 seconds, repeating this three times before displaying the fault. The issue points to a problem with water delivery to the machine, whether from the supply line or the inlet valve itself.

The dishwasher will not complete a wash cycle while the 4E5 error is active because it cannot confirm that water has entered the tub. Running the machine in this state will not cause immediate safety hazards, but it will not clean dishes and the error will persist until the underlying water supply issue is resolved. It is best to address the fault before attempting further cycles.

If the fix is as simple as clearing a kinked hose or opening a shut-off valve, there is no parts cost involved. Replacing a water inlet valve typically costs between $25 and $75 for the part, plus labor if a technician is hired, bringing total repair costs to a range of roughly $100 to $200. Flow sensor replacements can vary in price depending on the specific model, so sourcing the correct part number for your unit before purchasing is recommended.

Start by confirming the household shut-off valve is fully open and the supply hose is not kinked. Next, inspect the mesh filter screen at the water inlet valve connection for clogs and clean it if necessary. If those checks pass, test the inlet valve solenoid for proper electrical continuity and replace the valve if it has failed. If the valve is functioning correctly, the flow sensor or its wiring harness should be inspected next.

A reset may temporarily clear the displayed code, but the error will return if the root cause has not been fixed. The 4E5 fault is triggered by an actual condition the control board detects during the fill cycle, so the underlying water supply or inlet valve problem must be corrected for the machine to operate normally. A reset is useful for confirming whether the issue was a temporary one, such as a brief pressure drop, but it is not a repair.