Boiler displays FAN or Fan Failure; inducer does not start or stops unexpectedly.

Safety first: Turn off power at the breaker before touching the fan or wiring. Do not bypass safety controls to force the fan to run.

• Listen for the fan: Call for heat and observe. If the fan does not start at all, proceed with electrical checks. If it starts then stops with noise, the motor or wheel may be binding.
• Check wiring connections: Remove the front panel and verify the inducer motor plug and wires are firmly connected and not burned or loose.
• Inspect for obstructions: With power off, spin the blower wheel by hand (if accessible). It should rotate freely without scraping. Remove any visible debris.
• Check power to the fan (advanced): A qualified person with a multimeter can verify if the control board is sending power to the inducer when there is a call for heat. If power is present but the fan does not run, the inducer motor is likely failed.

When to call a professional: Replacement of the inducer assembly and diagnosis of control board fan outputs should be done by a trained technician.