F14
Thermeau
Fan Speed / RPM Feedback Fault
Heater shows F14 and refuses to start; may be accompanied by fan not running.
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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 Thermeau combustion blower motor, Faulty fan speed sensor or tachometer, Obstructed blower wheel, Loose fan connector
How to Fix / Troubleshooting
Safety first: Disconnect power and gas before accessing the blower assembly.
- Inspect blower wheel: Remove the blower cover and check for debris, rust, or broken blades that could prevent proper rotation.
- Check wiring: Ensure the blower motor connector and any tachometer/speed sensor plugs are fully seated and undamaged.
- Spin test: With power off, gently spin the blower wheel by hand. It should rotate freely without grinding. A stiff or seized motor requires replacement.
- Operational test: Restore power and call for heat while observing the blower. If it does not start or runs erratically before F14 appears, the motor or speed sensor is likely faulty.
- Replace blower assembly: Install a new Thermeau combustion blower assembly if the motor or speed feedback is defective.
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Repair Difficulty
Hard
4/5
Required Part
Thermeau Combustion Blower Assembly
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