LG Dryer nP Error Code: What It Means and How to Fix It

By Dan Mercer · Published October 5, 2026 · Updated October 6, 2026 · Codes covered: nP · Sources

An nP code on an LG dryer means the dryer isn't detecting any current at the heater. LG says this normally points to a problem with the electrical wiring in your home, not the dryer itself. The drum may still turn, but the clothes stay cold and damp.

You can safely check two things yourself: the plug and the breaker. If those don't fix it, the next step is a licensed electrician, not a screwdriver.

This 3-minute fix saved 0 homeowners a technician visit this month.

What the nP code means

LG says an nP code "indicates there is no current being detected at the heater. This normally indicates a problem with the electrical wiring in the home."

Here's why that happens. An electric dryer runs on a 240-volt circuit made of two separate "legs" of power. LG notes that electric dryers use two circuit breakers, while gas dryers usually use one. iFixit's LG no-heat guide explains that a tripped breaker can drop the heating leg. The dryer can then still power on and tumble, but the heater gets nothing.

That's why nP usually shows up as "runs but won't heat."

LG's nP steps all refer to a grounded 240-volt outlet, so this is an electric-dryer code. On a gas dryer, check your manual and contact LG.

Look-alike codes:

• PS means improper voltage in the power cord. LG says the white and red wires may be reversed on the dryer's terminal block, an installation problem for the installer or a pro.
• PF means a power failure, usually after an outage. LG's fix is a control reset: unplug the dryer, hold Start/Pause for 5 seconds, then restore power.

Likely causes (most common first)

1. One half of the dryer's double breaker has tripped. This is the classic cause of "runs but no heat."
2. A breaker that needs a reset. LG says turning it off for at least 10 seconds clears a "power surge" inside the breaker.
3. A blown fuse in older homes with a fuse box. LG's owner's manual lists a blown house fuse or tripped breaker as a cause of no heat.
4. A plug that isn't fully seated, or a damaged cord or outlet.
5. Outlet or house wiring that isn't supplying the correct voltage. LG says a licensed electrician may need to check the outlet.
6. A new install with a cord problem. If the dryer was just installed, LG says to have the installer check the cord installation and the wall outlet.
7. A fault inside the dryer. If the outlet checks out fine, LG says the unit needs repair service. iFixit's no-heat guide points to the heater assembly, thermal cutoff, thermostat or thermistor.

How to fix it, step by step

Stop at the first step that clears the code.

1. Turn the dryer off.
2. Check the plug. Make sure it's pushed firmly into the outlet. LG says it should be a grounded outlet that matches the dryer's rating plate of 240 volts.
3. Look at the plug and cord without touching the outlet's insides. Look for burn marks, melting, or a cracked or loose-feeling plug. If you see any of these, leave the dryer unplugged and call an electrician.
4. Go to your main electrical panel. Find the breaker labeled for the dryer. On an electric dryer, it's usually a double breaker with two linked switches.
5. Reset it. Switch it fully OFF, wait at least 10 seconds (LG's guidance), then switch it firmly back ON.
6. Watch what happens.
   • If the breaker trips again right away, leave it off and call an electrician. LG's manual says a circuit overload should be corrected by a qualified electrician.
7. If your home has fuses, LG's manual says to replace a blown fuse but never increase the fuse capacity. If you're not sure what's correct, call an electrician.
8. Run a short heated cycle. LG's power troubleshooting guide says to let it run for 30 seconds, then open the door and feel inside. A warm drum means it's heating.
9. If nP is still there, stop. The next step is checking the outlet's voltage. That means working with live 240-volt power, and LG says the outlet may need checking by a licensed electrician.
10. Request LG repair if the electrician confirms the outlet is supplying the correct voltage and nP continues. LG says the dryer then requires repair service.

Test the part

For nP, the main "part" is your home's power supply, and that can't be tested safely by a homeowner. Measuring it means probing live 240-volt power. That's electrician work.

What you can do safely:

1. Unplug the dryer (switch its breaker off first if the plug is hard to reach).
2. Inspect the plug and cord. Look for scorching, melted plastic, bent prongs or a cord that's been crushed behind the dryer. Don't open the wall outlet.
3. Leave the dryer's terminal block cover on. Wiring problems there are for the installer or a pro.
4. Only after an electrician confirms good power should anyone check the heater parts inside the dryer. In iFixit's LG guide, reaching them means removing the top panel, control panel, front cover, front bulkhead and drum.
   • With the dryer unplugged, a thermal cutoff or thermostat should read near zero (continuity). OL means it has opened.
   • The heating element should show resistance, not OL. iFixit also says a reading between a terminal and the heater can means a grounded element, which is dangerous.

Swipe the table sideways to see every column.

1. Stop and call a pro if you'd need to take the cabinet apart and haven't done it before, or if every part tests fine. A control board fault needs live testing.

Safety notes

When to call a pro

Call a licensed electrician if:

• nP is still there after you've reseated the plug and reset the breaker for at least 10 seconds.
• The dryer breaker trips again, won't stay on, or one switch feels loose.
• You see burn marks or damage on the plug, cord or outlet.
• Your home has a fuse box and you're not sure which fuse feeds the dryer or what rating it needs.

Testing the outlet means measuring live 240-volt power. That's the honest stop point for a homeowner.

Call the installer if the dryer was just installed. LG says they should check the cord installation and the outlet.

Request LG repair if the electrician confirms the outlet is supplying the correct voltage and nP continues. Also contact LG first if the dryer is under warranty.

You can reach LG support through lg.com/us/support or at 1-800-243-0000, as listed on LG's contact page.

FAQ

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