Furnace Blower Motor Hums But Won T Start

If your furnace blower motor hums when it s switched on but at the same time does not actually turn the capacitor may be damaged. This can typically be attributed to your pilot light. This problem of getting a humming noise along with little to no spinning is very common with motors that do not have good quality capacitors.

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Starting caps provide a phase shift to help the motor start.

Furnace blower motor hums but won t start. Get an insulated screwdriver rubber synthetic plastic handle and make sure there are no. The capacitor s are usually close to the motor in a electrical box on the unit some motors have the caps mounted on the motor but more often in a hvac system they are behind a panel. Slip out the capacitor and pull off the connectors. The first is a starting capacitor that has gone bad.

You should replace the capacitor with a good one and the blower motor will work smoothly. Furnace blower motor hums but won t start. In order to correct the issue you simply need to readjust the pilot light to the correct level. Remove the screws holding the bracket.

Once this is done the humming should correct itself. You can clearly hear the furnace blower motor hum but it won t start.