Furnace displays E08; often associated with fan or flue sensor issues.

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.

Possible Causes

Fan not reaching speed, Faulty fan tachometer, Flue sensor out of range, Control board fan circuit fault

Safety first: Turn off power and gas before accessing the fan or flue sensor.

Inspect fan assembly: Check for debris, damaged blades, or signs of overheating. Ensure the fan spins freely by hand.
Check connectors: Reseat the fan power and tachometer connectors on the control board.
Test flue sensor: Verify the flue NTC resistance and replace if out of specification.
If E08 persists: The fan or control board may require replacement by a qualified technician.

Hard 4/5

Flue Fan Assembly / Flue NTC Sensor

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