LG Dryer Won't Stop — Troubleshooting Guide

An LG dryer that continues running after the cycle should have ended — or that won't respond to the Stop button — indicates a control system failure or sensor issue. Unlike washers (which have mechanical interlocks), dryers that won't stop primarily have electronic control issues.

Most Common Causes (Ranked by Likelihood)

1. Moisture Sensor Reading Perpetually Wet (35% of cases)

In Sensor Dry mode, if the moisture sensor bars are shorted (water, lint, or debris bridging the two bars), the control board perpetually reads "wet" and refuses to end the cycle. The dryer continues tumbling and heating indefinitely.

Symptoms: Only affects Sensor Dry mode (Timed Dry completes normally), dryer runs for hours past expected time, display shows time remaining but never reaches zero.

LG-Specific Fix:

1. Open the door to stop the dryer
2. Inspect sensor bars (inside drum near lint filter slot) — look for debris bridging the two bars
3. Clean bars with isopropyl alcohol and dry cloth
4. Check for standing water in the lint filter area (should be dry)
5. Test: run Timed Dry for 10 minutes — if it stops correctly, the sensor system was the issue

2. Control Board Relay Stuck (30% of cases)

If the motor relay on the control board welds closed, the motor continues running even after the cycle logic sends a stop signal. The display may show "End" or return to standby, but the motor and possibly the heater keep running.

Symptoms: Display shows cycle complete but drum keeps turning, pressing Power Off button has no effect on motor (display turns off but motor runs), only unplugging stops the dryer.

LG-Specific Fix: This is a safety issue — unplug the dryer. The control board needs replacement. The welded relay will re-engage the motor as soon as power is restored.

Parts Cost: $100–$250 Professional Repair Cost: $250–$400

3. Timer/Control Logic Fault (20% of cases)

The control board's cycle management logic has failed — it cannot determine when to end the cycle. Different from a relay weld because the board is not sending the stop signal (rather than sending it and having it ignored by a welded relay).

Symptoms: Cycle time remaining on display never changes (or counts up instead of down), pressing cycle change buttons has no effect, or dryer restarts after briefly stopping.

Fix: Power cycle (unplug 5 min). If problem recurs: control board replacement needed.

4. Wrinkle Guard / Extended Tumble Feature (10% of cases)

LG dryers have a Wrinkle Guard feature that periodically tumbles clothes after the cycle ends to prevent wrinkles. This can seem like the dryer "won't stop" if you're not familiar with the feature — the drum briefly rotates every few minutes for up to 2 hours after cycle completion.

This is normal behavior, not a malfunction.

LG-Specific Fix: If you don't want Wrinkle Guard: open the door to deactivate it, or disable the feature in cycle settings before starting.

5. Button Fault (5% of cases)

If the Start/Stop button membrane has failed in the depressed position, the control board continuously receives a start signal.

Fix: Try pressing Stop/Power firmly and releasing. If the button feels stuck: the membrane panel needs replacement.

Immediate Action for Unstoppable Dryer

1. Open the door — the door switch should break the motor circuit immediately
2. If motor continues with door open: UNPLUG immediately (door switch may have also failed)
3. A dryer running with door open is a safety hazard — do not use until repaired

Prevention Tips

• Clean sensor bars regularly to prevent false "wet" readings that extend cycles indefinitely
• Use surge protector to prevent control board relay damage from power spikes
• If Wrinkle Guard causes confusion, disable it in settings
• Address any intermittent stop-button issues immediately

FAQ

Q: My LG dryer tumbles briefly every few minutes after the cycle ends — is it broken? No — this is the Wrinkle Guard feature preventing wrinkles by periodically tumbling clothes. It runs for up to 2 hours after cycle completion. Open the door to stop it.

Q: My LG dryer won't stop even when I open the door — is this dangerous? Yes — the door switch should always stop the drum immediately. A dryer running with the door open has exposed rotating components that can catch hair, clothing, or hands. Unplug immediately and schedule repair.

LG Wrinkle Guard Feature — Often Mistaken for "Won't Stop"

LG dryers include a Wrinkle Guard (also called Wrinkle Care) feature that activates AFTER the drying cycle completes. This feature periodically tumbles the drum without heat to prevent wrinkles from setting into dry clothes. On most LG models:

• Wrinkle Guard activates automatically after any drying cycle
• The drum briefly tumbles every 5-10 minutes
• This continues for up to 2-3 hours after cycle completion
• The display shows the Wrinkle Guard indicator
• Opening the door at any time deactivates it

This is NOT a malfunction — it is a designed feature. To disable: open the door to stop it immediately, or deselect Wrinkle Guard in cycle options before starting.

How to distinguish Wrinkle Guard from a real malfunction:

• Wrinkle Guard: brief tumble (30 seconds), pause (5-10 minutes), brief tumble, repeat. No heat.
• Malfunction: continuous tumbling without stopping, possibly with heat still on. Display may show abnormal information.

LG Dryer Motor Circuit Isolation for Won't-Stop Condition

If your LG dryer truly won't stop (continuous operation, not Wrinkle Guard), and pressing Power Off doesn't stop the drum motor:

1. Open the door — the door switch should break the motor circuit. If the drum stops: the control board relay has welded but the door switch still functions. This is the most common scenario.
2. If the drum doesn't stop even with the door open: Both the relay and door switch circuit have failed. Unplug the dryer immediately. This is a rare but dangerous double failure.
3. After unplugging, the control board needs replacement. Before replacing, also verify the door switch is functional — if the door switch failed open (which should stop the motor), it may not be the switch but rather a bypass in the board's relay circuit.

Power surge correlation: Control board relay welding often follows power surges. If your area experiences frequent power fluctuations, install a surge protector rated for your dryer's circuit (240V/30A for electric, 120V/15A for gas).

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A dryer that won't stop needs urgent diagnosis. Our technicians carry LG control boards and sensor components for same-visit repair. Schedule urgent service →