tO
Frigidaire
Thermistor open (temperature sensor open circuit)
Frigidaire dryer displays tO and may not heat or may shut down.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed thermistor (open), Broken thermistor wiring, Loose thermistor connector, Faulty main control board sensor input
How to Fix / Troubleshooting
Safety First: Unplug the dryer before accessing the thermistor or control board.
- Access thermistor:
- Remove the rear or front panel to reach the blower housing or exhaust duct.
- Inspect wiring:
- Check for broken wires or disconnected plugs at the thermistor.
- Test thermistor:
- Disconnect the thermistor and measure resistance at room temperature.
- An infinite (OL) reading indicates an open thermistor; replace it.
- Check harness continuity:
- Ohm the wires from the thermistor connector to the main control board.
- Replace faulty parts:
- Install a new thermistor if open.
- If wiring and thermistor are good, replace the main control board.
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Repair Difficulty
Medium
3/5
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