nP Serious Moderate DIY
LG Washer nP — No current detected at heater
LG Washer · Error code nP
What nP Means
On WashTower and combo units, nP indicates the control board sees zero current flowing to the heater — usually a household wiring / outlet issue rather than a washer fault.
Symptoms
- nP on the display
- Cycle aborts when heat is requested
- Cold cycles may complete
- Often appears after install on a new outlet
Common Causes
1
Outlet wired incorrectly
240V combo/WashTower needs a properly wired 240V receptacle matching the rating plate.
2
Tripped or weak breaker
Half of a double-pole breaker tripped — heater gets only 120V instead of 240V.
3
Loose terminal block at washer
Wires under the cover are loose — only one leg of 240V is live.
4
Failed heater or harness
Open heating element means zero current — same symptom as no power.
5
Power surge or unstable supply
Recent surge stressed wiring.
How to Fix It
- Turn off the dryer/combo breaker for at least 10 seconds, then back on.
- Verify the cord is fully seated in the wall outlet.
- With a multimeter, measure across the outlet hot legs — should read 240V (208V in some commercial buildings).
- If only 120V is present, reset both halves of the double-pole breaker; if still 120V, call an electrician.
- Unplug the unit, pull off the rear terminal block cover, and check that all lugs are torqued tight and not burned.
- If wiring is solid and 240V is present at the cord, suspect the heating element or board.
- If nP persists after wiring is verified, call for service.
More LG Washer Codes
Verified against manufacturer documentation: lg.com
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.