Safety: Turn off power and gas before servicing. Allow the heater to cool.

Check intake and exhaust: Inspect the air intake and vent termination for leaves, plastic bags, nests, or other obstructions. Clear any debris.
Listen for blower operation: Restore power and call for heat while observing the heater. The blower should start before ignition. If it hums, runs slowly, or does not start, turn power off and proceed.
Inspect blower wiring: Remove the front panel and verify that the blower motor plug and wires are firmly connected and not heat-damaged.
Test air pressure switch: The air pressure switch proves blower operation. Check tubing for cracks or blockages. With the blower running, the switch should close; if it does not, the switch may be faulty.
Replace blower assembly if needed: If the blower does not run or is noisy and seizing, replacement of the blower motor/assembly is typically required and may be best handled by a technician.

Heater displays E06 and will not fire; may occur immediately at startup.

Possible Causes