LG Dryer PS Error
Uppercase PS — and not nP: PS is about the cord's voltage and how the cord was wired; nP is about current reaching the heater.
What to check first
- PS = improper voltage within the power cord (LG US).
- Named cause: white and red wires reversed on the terminal block.
- Just installed → call the installer (LG's routing), not a repairer.
- Terminal-block wiring is professional work — this page keeps it there.
A PS code indicates improper voltage within the power cord — LG's US list, which adds the cause that explains most cases: the white and red wire may be reversed on the terminal block. That is why its UK list opens with “check the power cord installation on the back of the dryer”, and why the US list routes a just-installed machine straight back to the installer: if your unit was just installed, please call your installer so the cord wiring can be double-checked. The user-level checks are the familiar supply ones (grounded 240V outlet, breaker reset); the terminal block itself is installer/electrician territory, and this page keeps it there.
Safety first
- Terminal-block wiring is mains wiring. LG's own routing — installer for the cord, electrician for the outlet — is the safety boundary, and it is not a formality: reversed conductors are precisely the fault this code reports.
- Never open the terminal-block cover with the dryer plugged in. The checks below that involve the cord are visual and external; the wiring itself is a professional's job.
- Stop condition: stop using the machine and unplug it — and do not run it again until it has been checked — if you smell burning, see smoke, find damaged electrics (a scorched plug, a melted or cut cable), or water is leaking in quantity.
Common causes
Reversed wires on the terminal block
LG's named cause: the white and red wire may be reversed on the terminal block — a cord-installation error, which is why PS clusters on newly installed and newly moved dryers, and why LG's first call is to the installer.
The supply checks that come first
LG's lists still run the standard supply checks alongside: cord plugged securely into a grounded outlet matching the 240V rating plate, and the breaker switched OFF for at least 10 seconds from the main supply before being restored.
Step-by-step checks
- Just installed? Call the installer firstLG US's routing for a newly installed unit: call your installer so the cord wiring can be double-checked. A PS on day one is an installation case, not a repair case.
- Check the cord's installation (external check)LG UK's first step: check the power cord installation on the back of the dryer — the cord correctly fitted and seated. The terminal-block wiring itself is the installer's/electrician's check, not a user rewiring job.
- Confirm the outletCord plugged securely into a grounded power outlet matching the 240V rating plate requirement. (LG US.)
- Reset the breakerTurn OFF the dryer's circuit breaker from the main power supply for at least 10 seconds, then restore. (LG US/UK.)
- Still not heating? Book repair serviceLG's endpoint: if the unit is still not heating, it will require a repair service.
When to call a technician
Service — or first, the installer — is LG's routing for PS: installer for a just-installed unit's cord wiring, a licensed electrician for the outlet, repair service when the dryer still will not heat with the supply and cord proven. Quote PS exactly, and say whether the machine was just installed; LG's own lists split on that fact.
Model differences
| What you have | What changes |
|---|---|
| Brand-new or just-moved dryer | The reversed-wire case: LG's instruction is to call the installer to double-check the cord wiring. Do not rewire it yourself. |
| Display reads nP instead | nP is no current detected at the heater — home-wiring side, different checks: the nP page. |
One-page checklist — PS
- Code read as PS (improper voltage in the cord)
- Just installed → installer called (LG's routing)
- Cord installation checked externally; outlet = grounded, 240V rating plate
- Breaker OFF ≥10 seconds, then ON
- Still not heating → repair service
Official LG references
Frequently asked questions
My dryer is brand new and shows PS. Is it broken?
Almost certainly not — LG's US list ties PS to the cord wiring (white and red reversed on the terminal block) and instructs: if your unit was just installed, call your installer so the cord wiring can be double-checked. PS on day one is an installation error surfacing, not a failed dryer.
Can I swap the terminal-block wires myself?
This page does not publish that as a user step, because LG does not: its routing is the installer for the cord and a licensed electrician for the outlet. Reversed mains conductors are the fault the code is reporting — the fix belongs to the person qualified to certify it.
PS vs nP — which do I have?
Read the display exactly. PS: improper voltage within the power cord (cord/terminal-block installation). nP: no current detected at the heater (wiring in the home). LG lists them as a pair because they split the supply problem — installation side vs supply side — and the first call differs.