Samsung Dryer Will Not Stop — Troubleshooting Guide
When your Samsung dryer continues running indefinitely — refusing to end the cycle, not responding to timer countdown, or restarting after completion — the issue lies in the moisture sensing system, control board cycle logic, or a stuck relay.
Two Types of "Will Not Stop"
Type A: Heats and tumbles indefinitely (SAFETY CONCERN)
Continuous heating can overheat the dryer. Causes: failed moisture sensors, thermistor providing incorrect readings, or heater relay stuck on board.
Type B: Tumbles without heat after cycle "ends"
Heating stopped but motor continues. Causes: board timer failure, stuck motor relay, or misidentified Wrinkle Prevent feature.
Quick identification: Feel exhaust air. Still hot after cycle should have ended = Type A (dangerous). Cool air only = Type B (annoying, not immediately hazardous).
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Most Common Causes
1. Contaminated Moisture Sensors — Type A (30% of cases)
Samsung's cycle termination requires moisture reading below "dry" threshold for a sustained 3-5 minute period. Contaminated sensors that bounce between readings never achieve sustained dry confirmation.
Samsung safety feature: Maximum cycle duration limit (3-5 hours) forcibly ends the cycle. If your dryer eventually stops after 3-5 hours, sensor contamination is confirmed.
Fix: Clean both bars with isopropyl alcohol and 220-grit sandpaper. Verify in diagnostic mode: dry drum shows 200K+ ohms, damp fabric shows 5K-50K ohms.
Parts Cost: $0 (cleaning) or $25-$45 | Professional Cost: $120-$180
2. Thermistor Reporting Cold — Type A (20% of cases)
Samsung's multi-factor termination requires: (1) moisture below threshold AND (2) temperature within expected range AND (3) sustained duration of both. A drifted thermistor (DC32-00007A) prevents condition #2.
Testing: At room temperature, should read approximately 10K ohms. Readings of 15K+ indicate the "cold" reporting problem.
Parts Cost: $8-$25 | Professional Cost: $120-$180
3. Control Board Timer/Relay Failure — Types A or B (18% of cases)
Relay stuck closed (Type A): Heater relay welds from power surges. Board may try ending cycle but element continues. Error code HE2 — unplug immediately.
Motor relay stuck (Type B): Motor runs continuously after timer expires. Display may show "End" but drum keeps tumbling.
Parts Cost: $150-$350 | Professional Cost: $280-$450
4. Wrinkle Prevent Misidentification (15% of cases)
Samsung's Wrinkle Prevent tumbles the drum every 5 minutes for up to 3 hours post-cycle — this is NORMAL when enabled.
Identification: Display shows "End" (cycle actually complete). Wrinkle Prevent indicator is lit. Tumbles briefly without heat. Opening door terminates the feature.
To disable: Press Wrinkle Prevent button before starting next cycle.
5. Failed Door Switch — Type B (10% of cases)
If door switch (DC64-01538A) contacts weld closed, the board receives permanent "door closed" signal — even with door open. Drum may continue spinning with open door. Unplug immediately if this occurs.
Parts Cost: $15-$30 | Professional Cost: $95-$150
6. Timed-Dry Timer Malfunction (7% of cases)
Board's internal clock or timer circuit failed. Select short Timed Dry (20 min), watch 5 minutes — if display does not decrement at all, timing circuit has failed. Board replacement needed.
Emergency Stop Procedures
- Press and hold Power button 5 seconds.
- Open the door (interrupts door switch circuit).
- Unplug from wall outlet.
- Trip the circuit breaker if outlet is inaccessible.
NEVER attempt to stop the drum physically — motor torque can cause injury.
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Gas dryers carry carbon monoxide and explosion risk. Even electric dryers involve 240V circuits that can deliver a fatal shock. Our techs are licensed and insured — let them handle the risk.
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Prevention
- Clean moisture sensors monthly.
- Install surge protection.
- Know your Wrinkle Prevent setting.
- Replace aging door switches at 5-7 years proactively.
- Use Timed Dry periodically to isolate sensor issues.
FAQ
Q: Samsung dryer runs 3+ hours then finally stops — normal?
No, but it confirms the maximum-time safety limit is terminating the cycle. Normal cycles complete in 45-90 minutes. Running to 3-5 hour maximum means sensors cannot detect "dry" — clean them.
Q: Why does my Samsung dryer restart after I open the door?
Board's cycle-completion logic has not registered done. Brief opening was not long enough for board to acknowledge. Hold door open 5+ seconds.
Q: Is a Samsung dryer that will not stop dangerous?
Type A (continuous heating) is dangerous — prolonged overheating can ignite lint. Type B (tumbling without heat) is not immediately dangerous. Do not leave unattended in either case.
Q: My Samsung dryer will not stop even when I press the Power button — what should I do?
If the Power button is unresponsive, the control board's input circuit may have failed or the membrane switch may be stuck. Your options in order: press and hold Power for 5 full seconds (forced shutdown on most Samsung models), open the door to interrupt the door switch circuit, unplug the dryer from the wall, or trip the circuit breaker. Once stopped, do not attempt to restart until the board has been inspected. Samsung's SmartThings app may still be able to send a stop command to connected models even when the physical interface is unresponsive.
Q: Could a power outage have caused my Samsung dryer to run indefinitely?
Yes — power events (surges, brownouts, and outages with subsequent restoration) are a documented cause of Samsung control board relay welding. When power is restored after an outage, the inrush current spike can weld the heater relay contacts closed. If your Samsung dryer started exhibiting "will not stop" behavior after a power event, the control board relay is the most likely cause. Samsung boards are notably more susceptible to this failure mode than Whirlpool or LG equivalents due to the relay specifications used in DV/DVE series boards. Installing a 240V/30A surge protector prevents this failure.
Q: Will my Samsung dryer warranty cover a stuck relay or board failure?
Samsung's standard 1-year warranty covers manufacturing defects including control board component failures. If the relay welded due to a power surge, Samsung may consider it an external cause and deny coverage. However, if the failure occurs within the warranty period and no external event is documented, the board replacement should be covered. Samsung's 10-year inverter motor warranty does not extend to the control board. Document the failure with photos and SmartThings diagnostic data to strengthen any warranty claim.
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