Lennox Blower Motor Not Starting

Thermostat calls for heat but furnace only runs the inducer; blower never comes on and furnace overheats.

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

Failed blower motor, Bad run capacitor (PSC motors), Loose blower wiring harness, Faulty blower relay on Lennox control board

Safety: Turn off power before touching blower components.

1. Listen for motor: If the motor hums but does not spin, the capacitor or motor may be bad.
2. Inspect capacitor: Look for bulging or leaking on the blower capacitor and replace with the same µF and voltage rating if defective.
3. Check wiring: Ensure all blower wires are firmly connected per the Lennox wiring diagram.

If blower still does not start, a technician should test motor windings and board outputs.

Hard 4/5

Blower Motor Capacitor

Check Price on Amazon

We may earn a commission from links on this page.