What nP means (lg np error)
An lg np error means an LG electric dryer is getting no current at the heater — most often because one of the two 240V supply legs is missing. An electric dryer needs both legs to heat; if one is lost at the breaker, cord, or terminal block, the drum may turn but the dryer will not get hot.
Symptoms to look for
The signs below help confirm you are dealing with this condition rather than a different fault on your LG Dryer. You may see one of them or several together, and they can build up gradually or appear suddenly after a power event, a long door opening, or recent service.
- The display shows “nP”
- The drum turns but the dryer does not heat
- The load stays cold and damp
- The fault may follow electrical work or a half-tripped breaker
Common causes
Several different faults can produce these symptoms. Working through the most likely causes in order helps separate a quick, owner-level check from a problem that needs trained service and the correct LG parts.
- Half-tripped double breaker — one of the two 240V legs is off
- Loose cord connection — a terminal at the cord or block is loose
- Damaged power cord — a broken conductor in the cord
- Outlet or wiring fault — a lost leg at the receptacle
Troubleshooting steps you can try
Work through these checks in order before calling for service. Stop wherever you are unsure, or where high-voltage parts, gas, the sealed refrigeration system, or a heat-pump compressor are involved, and hand the rest to a qualified technician.
- Fully switch the dryer’s double breaker off and back on to reset both legs.
- Confirm the dryer is plugged into a correctly wired 240V outlet, not a 120V one.
- If you are comfortable and the power is off, check the cord is firmly secured.
- Because this involves 240V wiring, leave the diagnosis to a technician if nP persists.
Parts a technician may replace
Depending on what the diagnosis shows, a technician may inspect, test, or replace the power cord, household 240v circuit/breaker, terminal block, and heater. The correct part for your LG Dryer is matched from the model and serial number, and genuine LG components are fitted rather than generic substitutes so that performance, safety, and the appliance’s long working life are all protected. Confirming the failed part before ordering avoids replacing more than the fault actually requires.
When to call a technician
nP needs a technician (or electrician) to confirm both 240V legs reach the dryer and to check the cord, terminal block, and outlet. When the fix calls for trained service, book a visit through our scheduling page and an experienced, qualified technician will diagnose and repair it. For manufacturer documentation and model lookup, see the manufacturer at lg.com/us.
Prevention and care
Regular care keeps this condition from returning on your LG Dryer. Keep filters, vents, and the condenser or exhaust path clean, avoid overloading or blocking airflow, check that doors and seals close cleanly, and follow the LG maintenance guidance for your model. Because this unit relies on electronic control, protect it with a stable, correctly rated power supply and have any built-in or laundry installation done to LG specification so the control never sees an out-of-range condition. If a code appears, note exactly what was shown before you reset the appliance — that record helps the technician reach an accurate diagnosis and avoid replacing parts unnecessarily. Where stored food, a sealed refrigerant system, gas, or a safety lockout is involved, treat the condition as a reason to act quickly rather than wait.
Related help and LG resources
Browse other LG Dryer diagnostics, read about professional LG Dryer repair, look up your unit in the LG models reference, or the related PS cord voltage error, or schedule a service visit. For LG manufacturer documentation and model lookup, visit the manufacturer at lg.com/us.
