A dryer that stops before the load is dry is doing one of two very different things, and separating them is the whole diagnosis. Either it is overheating and a safety device is cutting it out — which is a blocked-airflow problem with a real fire risk behind it — or it thinks the load is already dry and is ending the cycle correctly on bad information. The first is urgent. The second is usually a two-minute wipe with rubbing alcohol.
Read this first
- A dryer that overheats is a fire risk, and lint is the fuel. Treat a machine that cuts out on heat as a safety problem, not an inconvenience.
- Unplug the dryer and shut the gas valve on gas models before opening any panel.
- Never bypass a thermal fuse or a high-limit thermostat. They exist because the alternative is a vent fire.
- Let the machine sit unplugged for an hour before testing a motor you suspect has tripped its thermal overload.
Step by step
Separate 'stops early' from 'stops and will not restart'
These are different faults. A dryer that finishes its cycle early, beeps normally, and will restart immediately is ending on a sensor reading — go to the moisture sensor steps. A dryer that stops partway, goes dead, and will not restart until it has sat for half an hour is tripping a thermal device on heat, which means airflow. A dryer that stops and never restarts at all has usually blown a thermal fuse outright.
Clean the entire vent run
Restricted airflow is the root cause of nearly every overheating cut-out. Disconnect the duct at both the machine and the wall and run a rotary vent brush through the full length, not just the accessible first few feet — the compacted plug is usually at an elbow further along. Vacuum both ends and the dryer's own outlet port. Then go outside and confirm the exterior hood flap blows wide open with a strong warm draft when the dryer runs.
Wipe the moisture sensor bars
Automatic cycles judge dryness by measuring conductivity across two metal strips, usually just inside the drum opening or on the lint screen housing. Fabric softener and dryer sheet residue build an insulating film on them, so the load reads as dry within minutes and the machine shuts down with wet clothes inside. Wipe them with rubbing alcohol on a cloth until they are bright bare metal. This is free and it is the single most common cause of a cycle that ends early.
Compare timed dry against auto dry
Run a load on a timed cycle at 40 minutes and see whether it completes. If timed dry runs to the end and auto dry quits after ten minutes, the sensing circuit is the fault and the heating side is fine — that confirms the sensor bars or their wiring rather than a thermostat. If timed dry also cuts out partway through, you are overheating and the answer is in the vent and the thermostats.
Water-test the lint screen
Hold the lint screen under a running tap. Water should pour straight through. If it beads and sits on the mesh, the screen is glazed with softener residue — an invisible film that chokes airflow badly enough to trip a high-limit thermostat on a long cycle. Scrub it with hot water, dish soap and a soft brush, rinse, and dry it. Do this every few months if you use dryer sheets.
Test the cycling and high-limit thermostats
With the machine unplugged and the back or front panel off, find the thermostats on the blower housing and the heater housing. Both should show continuity at room temperature. A high-limit that has opened permanently means the machine has been overheating, so replacing it without clearing the vent guarantees a repeat. These are sold as a cheap kit with the thermal fuse, and taking the kit is almost always the right call.
Check the door switch and the strike
A dryer that stops when someone walks past, or when the machine vibrates, often has a door switch that is only just making contact. Open the door and press the plunger by hand, listening for a click, then test it for continuity with a multimeter while actuated. Also look at the door strike — a worn or bent strike lets the door sit a millimetre proud, which is enough for vibration to break the circuit mid-cycle.
Check the outlet, cord and terminal block
An intermittent shutdown that affects the whole machine, display included, points at the supply rather than anything inside. Test the outlet, and with the breaker off, inspect the terminal block behind the dryer and the cord's terminations for scorching, discolouration or loose screws. Heat damage there is common on ranges and dryers that have been moved, and it is an electrician's job rather than an appliance repair.
What this repair costs
Doing it yourself
$0–$60
Hiring a technician
$130–$350
Prices are general estimates for typical US jobs, not quotes. What you actually pay depends on your appliance's brand and age, the part required, your region, and each shop's labour rate. The DIY figure assumes you supply the labour and buy the part yourself.
Parts you may end up buying
| Part | Install | Typical price | Typical lifespan |
|---|---|---|---|
| Thermal Fuse | easy | $5–$20 | One-time (blows when overheated) |
| Heating Element | moderate | $20–$60 | 8–15 years |
| Cycling and High-Limit Thermostats | easy | $10–$40 | 8–15 years |
| Drive Belt | moderate | $12–$45 | 8–14 years |
| Drum Rollers and Idler Pulley | moderate | $20–$70 | 7–12 years |
| Gas Igniter | moderate | $20–$65 | 6–12 years |
| Gas Valve Coil Kit | moderate | $20–$65 | 8–15 years |
| Door Switch | easy | $10–$40 | 8–15 years |
| Blower Wheel | moderate | $20–$70 | 10–15 years |
| Moisture Sensor Bars | easy | $15–$50 | 10+ years |
Still not fixed
When to call a pro
If the vent is clear end to end, the sensors are clean, the thermostats test good and the machine still cuts out, the fault is in the motor's internal thermal overload, the timer, or the control board — and a motor that repeatedly overheats needs diagnosing rather than replacing on a hunch. Call a duct cleaning service if your vent run is inside a wall or ceiling cavity you cannot reach; they have cameras and 30-foot rods. On gas dryers, anything involving the gas valve, burner assembly or supply line is licensed work.
More dryer guides
- Dryer Not Heating — Electric and Gas, Diagnosed in Order45–120 minutes
- Dryer Takes Too Long — Restore Full Drying Speed45–120 minutes
- Dryer Squealing or Thumping — Find the Worn Part60–150 minutes
- Dryer Won't Start — Complete Diagnostic Checklist30–75 minutes
- Dryer Drum Not Turning — Belt, Pulley and Motor Checks60–150 minutes
- Dryer Smells Like Burning — Stop and Find It Before the Next Load60–120 minutes
- Dryer Trips the Breaker — Find the Fault, Not a Bigger Breaker60–120 minutes
- Dryer Getting Too Hot — Scorched, Shrunk and Damaged Loads60–120 minutes
- Dryer Tearing or Snagging Clothes — Find the Sharp Edge45–90 minutes