Dryer Shuts off mid-cycle — Causes, Fixes & Repair Costs

Shuts off mid-cycle: The dryer starts and runs normally, then quits partway through with the load still damp — often it will restart only after it has sat and cooled for a while.

Also described as: stops partway through, quits mid-cycle, turns off before dry, cuts out and clothes still wet, shuts down then restarts when cool, dryer stops after 20-30 minutes

Likely causes

1. Restricted airflow tripping the cycling/high-limit thermostat or one-shot thermal cutoff — usually a clogged lint filter, packed vent run, or a lint-bound blower wheel letting heat build until the safety opens (Most common)
2. Failing exhaust thermistor or cycling thermostat that drifts and cuts the cycle early (often logs an airflow/overheat code on electronic models) (Common)
3. Drive-motor thermal overload opening when the motor runs hot, then resetting once it cools — the classic "runs, quits, restarts only after sitting 30+ minutes" pattern (Common)
4. Flaky timer or electronic control board, or a faulty door switch making intermittent contact (Occasional)
5. Gas models: usually a thermal fuse or high-limit opening from a restricted vent; less often a flame sensor cycling out under heat so the burner drops in and out part-way through (a failing igniter or flame sensor more often shows up as no heat at all) (Occasional (gas))

How we diagnose it — in order

1. Confirm the cool-down pattern and clear the easy airflow restrictions first: pull and clean the lint screen, then run the dryer with the load out and feel the exhaust at the exterior hood — weak or no airflow with the damper flap barely lifting points to a restricted vent or duct, the most common cause of a heat-trip shutdown.
2. Disconnect and inspect the full vent run: pull the dryer off the wall, disconnect the transition hose and rigid duct, and check for crushed hose, lint packing, or a stuck/blocked exterior hood. Clear the duct end-to-end so the machine can shed heat before condemning any internal part.
3. With airflow confirmed good, open the cabinet and inspect the blower wheel and housing: spin it by hand for wobble or a cracked/slipping hub, and clear any lint or sock packed around the fins — a compromised blower starves airflow and trips the same thermal limits even with a clear vent.
4. Test the heat-safety string on the heater/blower housing for continuity and correct switching: check the high-limit thermostat and thermal cut-off (and the cycling thermostat) — a cut-off that opens hot or a cycling thermostat dropping out early will kill heat or the cycle mid-run. Replace any that test open or out of spec, and never bridge a tripped cut-off without finding why it tripped.
5. On board-controlled models, verify the thermistor reading against temperature: a drifting inlet/exhaust thermistor (or a control board reading a false over-temp) will command a mid-cycle shutdown even with good airflow — confirm resistance tracks temperature before replacing the sensor or board.
6. If airflow, blower, thermostats, and sensing all check out, condemn the drive motor: a motor with worn bearings or a failing internal thermal overload runs until it heats up, trips, then restarts only after it cools — the exact cool-down-and-resume pattern. Confirm the motor is the source (hot, noisy bearings, overload opening on heat) before replacing it, as it is the definitive and most expensive repair.

Time on site

1–1.5 hours

Visits

Usually 1

Typical all-in

$250–$420

Repair vs. replace

Almost always worth repairing — most fixes are an airflow clear plus a thermostat/thermistor or overload; reconsider only if it's a failed motor or control board on a 12+ yr unit.

Seasonality

Shows up more in winter, when the exterior vent hood ices or frosts over and chokes the run, tipping a marginal vent into a heat cutout.

Error codes

LG: D80 / D90 / D95 (vent airflow restricted ~80–95% — dryer runs hot, then cools and stops), Samsung: HC (overheating — heat shut off and cycle paused), Whirlpool / Maytag: AF or "Check Vent" (restricted air flow), Whirlpool / Maytag: F4E3 (restricted air flow — vent/exhaust restriction)

Related: Not heating · Drum not spinning · Making noise (squeaking, grinding, thumping)