Heater displays E10; blower may not start or stops unexpectedly.

Safety: Turn off power and gas. The blower is part of the combustion system; improper repair can be hazardous.

Steps:

• Listen for blower: On a call for heat, the blower should start before ignition. If it hums, squeals, or does not run, suspect a blower issue.
• Inspect blower area: Remove the top or front panel to access the blower assembly. Check for debris, nests, or rust buildup in the blower wheel. Spin the wheel by hand (power off) to ensure it turns freely.
• Check wiring: Verify the blower motor plug is fully seated and wires are not burned or loose.
• Test voltage (advanced): With a multimeter and appropriate safety precautions, a technician can verify that the control board is sending power to the blower. Homeowners should avoid live testing unless experienced.

If the blower is seized, noisy, or not receiving proper voltage, replacement of the blower assembly or control board is typically required and should be done by a professional.