F3
Haier
Exhaust Thermistor Out of Range
Haier dryer shows F3 and may stop heating or shut down unexpectedly
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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
Shorted or open exhaust thermistor, Thermistor wiring short to chassis, Incorrect replacement sensor installed, Faulty control board reading
How to Fix / Troubleshooting
Safety first: Disconnect power before accessing the rear panel and wiring.
- Locate exhaust thermistor: Remove the rear panel to find the thermistor mounted on the exhaust duct.
- Inspect wiring: Check for pinched, frayed, or melted wires leading to the thermistor. Repair any damage and secure the harness away from hot surfaces.
- Measure resistance: Disconnect the thermistor and measure its resistance at room temperature. Compare to the Haier specification. A reading of 0 Ω (short) or infinite (open) indicates a bad sensor.
- Replace thermistor: If out of spec, install a new Haier exhaust thermistor with the correct part number.
- Control board check: If a known-good thermistor and wiring are present but F3 remains, the main control board may be faulty and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Exhaust Thermistor
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