LG Dryer F1 Error — Heater Control Fault Fix Guide

What Does This Error Mean?

F1 is a heater control fault — the heater isn't responding correctly to the controller's commands.
Either the heating element has failed, the relay that powers it is stuck, or the temperature sensors are reading wrong.
This is service-tech work — don't keep cycling the dryer if F1 persists.
Heater faults are fire-risk territory.

Affected Models

LG DLE series electric
LG DLG series gas
LG TurboSteam
LG SignaturePRO
LG smart dryer

Common Causes

Heating element burned out
Heater relay welded closed or open
Temperature sensor sending bad data
Wiring damage between heater and controller
Control board heater output damaged

How to Fix It

Power-cycle the dryer.

Press Power off.
Unplug for 10 minutes.
Plug back in.
Wait for the display to fully boot.
Try a short Cool Air cycle.
If it completes without F1, the issue may be heating-specific.
If F1 returns immediately, treat as urgent.
Try a no-heat cycle.

Run a Cool Air or Air Fluff cycle.
If it completes without F1, the heater system is the problem.
If F1 appears on no-heat cycles too, the issue is broader (controller or wiring) and you should leave the dryer unplugged until service.
Don't keep restarting.
Check for burning smells.

Open the dryer and sniff inside.
Any odor of burnt rubber, plastic, or electrical?
If yes, this is urgent — the dryer should be left off and serviced immediately.
Burning smells with F1 mean a component has overheated and shouldn't be operated until repaired.
Clean lint trap and exhaust as preparation.

While waiting for service, clean the lint trap thoroughly and check the exhaust hose for clogs.
Restricted airflow stresses the heating system.
Even though F1 is electrical, related issues can be made worse by poor airflow.
Worth doing before the technician arrives.
Schedule LG service same-day if persistent.

F1 with persistent recurrence needs urgent service.
Most LG-authorized centers prioritize heater faults.
Out-of-warranty repair: 200–400 USD typical for heater element replacement, less if it's just a relay.
Free under warranty.
Don't delay — heater faults are safety concerns.

Frequently Asked Questions

Is F1 a fire risk?

Potentially, yes.
If the heater stays on uncontrolled, lint and fabrics can ignite.
Modern dryers have multiple thermal cutoffs that prevent this in most cases — F1 is one of those safety triggers.
Don't bypass or ignore F1.
The protection working is what's keeping things safe.

Should I unplug the dryer if F1 appears?

If F1 returns immediately on power restore (within seconds), yes — leave it unplugged.
Repeated automatic restart attempts on a faulty heater circuit can cause damage that makes the repair more expensive.
Unplug, schedule service, and wait.