Kenmore Dryer Won't Stop — Troubleshooting Guide

A Kenmore dryer that keeps running past the end of its cycle — refusing to shut off unless you open the door or unplug it — has a failed timer, control board, or cycling thermostat depending on the platform. The fix is different for mechanical-timer models (most 110-series Whirlpool) versus electronic-control models (newer 110-series, all 796-series LG, all 417-series Electrolux).

Mechanical Timer Models (110-Series, Pre-2012)

Timer Contacts Welded Shut (40% of Mechanical Timer Cases)

The mechanical timer uses cam-driven contacts to sequence the dryer through its cycle phases. When the contacts that control the motor circuit weld together (from arcing over thousands of cycles), the motor circuit stays energized regardless of the timer position. The dryer runs indefinitely — the timer may still advance, but it can never cut power to the motor.

Diagnosis: Advance the timer manually past the "Off" position. If the dryer continues to run with the timer at Off, the timer motor contacts are welded.

Parts Cost: $45–$90 (timer assembly, Whirlpool WP3976576 or model-specific) Professional Repair Cost: $150–$280

Timer Motor Failed (But Contacts Work)

If the timer motor dies while the dryer is running, the timer stops advancing but the current cycle contacts remain in whatever position they were in. The dryer keeps running in the same mode indefinitely because the timer cannot advance to the Off position.

Diagnosis: The timer knob does not move during the cycle. The dryer runs in one mode (heat or no-heat) indefinitely.

Same fix — replace the timer assembly.

Electronic Control Models

Control Board Relay Stuck (35% of Electronic Model Cases)

On electronically controlled Kenmore dryers (796-series LG, 417-series Electrolux, newer 110-series), the main control board uses relays to switch the motor and heater. When the motor relay welds shut, the motor runs regardless of what the control logic dictates. The display may show the cycle as complete, but the drum keeps turning.

Diagnosis: The display shows cycle ended or time expired, but the drum continues to run. Opening the door stops the drum (door switch still works), but closing the door and not pressing Start causes the drum to restart immediately.

Parts Cost: $80–$260 (main control board, platform-specific) Professional Repair Cost: $180–$400

Faulty Moisture Sensor Keeping Cycle Running (20% of Auto-Dry Cases)

On auto-dry cycles, the dryer runs until the moisture sensor detects that clothes are dry. If the moisture sensor bars are damaged, disconnected, or reading incorrectly (a shorted sensor that always reads "wet"), the dryer never receives the "dry" signal and runs indefinitely.

110-Series diagnosis: Clean the sensor bars with rubbing alcohol. If the dryer still runs endlessly on auto-dry but stops normally on timed-dry, the sensor or its wiring is faulty.

796-Series diagnosis: The thermistor-based system may keep running if the thermistor reads abnormally. Check thermistor resistance.

Parts Cost: $15–$30 (sensor bars or thermistor) Professional Repair Cost: $100–$200

Cycling Thermostat Failure — Continuous Heat Variant

If the dryer runs indefinitely AND overheats, the cycling thermostat has failed closed (stuck on). On auto-dry models, this prevents the timer from advancing (see "timer will not advance" guide) and also causes continuous heating.

This is more dangerous than a motor-only run-on because the dryer is generating uncontrolled heat. The high-limit thermostat and thermal fuse are the only remaining protection.

Stop the dryer immediately if it is running hot and will not shut off.

Platform Identification for Parts

Temporary Workaround

While waiting for parts or a service appointment, you can safely operate the dryer by:

1. Setting a kitchen timer or phone alarm for the expected cycle duration.
2. Opening the door to stop the dryer when the alarm goes off.
3. This is a temporary measure — the underlying fault should be repaired promptly.

Do not leave a run-on dryer unattended — the failure that causes continuous running can worsen (especially if combined with thermostat failure) and poses a fire risk.

Prevention

Mechanical timers and electronic relays are wear items that eventually fail. There is no meaningful prevention for these components. However:

• Surge protection extends electronic control board life.
• Clean the moisture sensor bars regularly on 110-series models to prevent unnecessary extended cycling that accelerates timer wear.
• Annual vent cleaning reduces thermal stress on all components.

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