If there is 120 volts at the induced draft fan motor but it is not running, where is the likely problem?

The presence of 120 volts at the induced draft fan motor indicates that there is power being supplied to the motor, but since the motor is not running, it typically points to an internal issue with the motor itself. When assessing the possible causes, open windings are a common problem in electric motors.

An open winding occurs when one of the coils inside the motor is broken or disconnected, preventing the flow of electricity through the motor and consequently causing it to fail to start or run. The voltage may still be present at the terminals, as it doesn’t indicate a complete path for electrical flow within the motor.

Identifying an open winding usually requires testing the continuity of the windings with a multimeter. This leads to the conclusion that if the motor has voltage but remains non-functional, the likely cause is an open winding within the motor itself, disrupting its ability to operate.