Goodman Furnace: Check induced draft blower motor

Check induced draft blower motor on a Goodman furnace: The induced draft blower is the motor that pulls flue gases through the heat exchanger and starts the whole ignition sequence. If it does not run, nothing else happens, so it is one of the first things to look at on a no-heat call. The test is two parts. First you check the motor windings with the power off, for continuity and for a short to the frame. Then you put power back on and see whether the motor is getting 115V during the ignition trial. Those two readings tell you whether the problem is the motor or something upstream of it.

Homeowner with a furnace problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

Applies to: Induced draft blower motor

Common causes of check induced draft blower motor

• Open winding in the motor
• Winding shorted to ground
• No 115V to motor during ignition trial, pointing at the control or wiring
• Seized or dragging motor bearings that trip the motor or the control

How to fix check induced draft blower motor: step by step

1. Shut off power, remove the burner door and disconnect the motor leads
2. Check continuity between each pair of motor leads with an ohmmeter. An open pair means a bad winding
3. Check each lead to the motor frame. Any reading to ground means replace the motor
4. If windings are good, reconnect the wires and power the furnace
5. Call for heat and measure 115V at the motor terminals during the ignition trial. Be careful, this is live line voltage
6. If 115V is present and the motor does not run, replace the motor
7. If there is no 115V, work back to the control and harness. Reinstall the burner door and verify operation

If the unit shows an error code, look it up: Goodman Furnace codes