What the “nP” code means on an LG Dryer
The nP error code on an LG dryer is typically an indication of a power interruption, power-sensing fault, or a control/communication issue that prevents the dryer from completing its normal operation. You may see nP after a sudden loss of electricity, a tripped breaker, or when the dryer detects inconsistent supply voltage. In some models it can also surface when the dryer’s main control board loses a routine handshake with sensors or switches. Common user impacts include the dryer failing to start, stopping mid-cycle, longer-than-normal drying times, or the machine appearing unresponsive. In more serious situations a persistent nP can point to damaged wiring, a failed control board, or a defective power terminal, which may create safety risks such as electrical arcing, overheating, or repeated cycle interruptions.
Common Causes
- Household power outage or intermittent power supply
- Tripped circuit breaker or blown fuse for the dryer circuit
- Loose or damaged power cord or terminal block connections
- Faulty main control board (PCB) or control board power supply
- Failed door switch or interlock preventing proper power/state sensing
- Damaged wiring or harnesses causing intermittent connections
- Faulty start switch or motor issues that mimic a power fault
- Blown thermal fuse or safety device that interrupts heater/power circuits
- Incorrect or insufficient incoming voltage (faulty outlet or supply)
Troubleshooting Steps
- Check power at the outlet: Confirm the dryer is plugged in and test the outlet with a known working device (or a multimeter). For electric dryers, ensure the 240V supply is present.
- Check the circuit breaker / fuse box: Reset any tripped breakers or replace blown fuses. Ensure the dryer circuit is on its dedicated breaker and not shared with heavy appliances.
- Inspect the power cord and plug: Unplug the dryer and visually inspect the cord for burns, frays, or damage. Tighten or replace the cord if loose or damaged.
- Examine the terminal block: With power off, check the rear terminal block connections where the cord meets the dryer for tight, clean connections and no signs of overheating.
- Reset the dryer: Unplug the dryer (or switch off the breaker) for 1–5 minutes, then restore power to clear transient faults and see if the code clears.
- Test the door switch: A faulty door switch can prevent the machine from sensing ready/power state. Confirm the switch clicks and continuity is present when the door is closed.
- Check for blown thermal fuse or safety cutouts: If the thermal fuse is open, it could present as a power/operation problem. Replace only after determining cause (e.g., venting/overheating).
- Inspect wiring and harnesses: Look for pinched, burned, or loose wiring inside the dryer cabinet (power off first). Wiggle-test harness connectors to spot intermittent faults.
- Run a diagnostic/self-test (if availa