E08
Chaffoteaux
Fan / Flue Fan Fault
Furnace shows E08, may attempt to start but shuts down quickly.
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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
Faulty fan motor, Fan wheel obstructed, Fan connector loose, Control board not supplying fan voltage
How to Fix / Troubleshooting
Safety: Isolate power before accessing the fan assembly. Do not bypass safety devices.
- Listen for fan operation: On a call for heat, the fan should start before ignition. If there is no fan noise, suspect a fan or control issue.
- Inspect fan area: Remove the combustion chamber cover and visually inspect the fan and venturi for debris, dust buildup, or foreign objects. Clean carefully with a soft brush and vacuum.
- Check wiring: Ensure the fan's electrical connector is fully seated on the fan and on the control board. Look for signs of overheating or burnt pins.
- Spin test: With power off, gently rotate the fan wheel by hand. It should spin freely without scraping. If stiff or noisy, the fan assembly should be replaced.
- Reset: After reassembly, restore power and reset the furnace. Persistent E08 requires professional testing of the fan and control board.
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Repair Difficulty
Hard
4/5
Required Part
Flue Fan Assembly
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