Furnace Blower Motor Capacitor Test

Although only pros should test or repair capacitors you can examine your.

Furnace blower motor capacitor test.

Set your voltmeter to the capacitor. Look at the wiring digram on the back of the furnace. If the capacitance number went up infinitely to the limit of your multimeter the capacitor has shorted out and should be replaced. Remove the wires that are connected to the terminals.

Failed capacitor would be my guess if no blower. If a motor doesn t have the torque to turn the blower wheel or the fan belt it won t start. This will cause the motor to run slowly causing excess heat. A faulty capacitor will not be able to hold the charge necessary to run the blower motor properly.

Using a capacitor tester to test the capacitor. Inspect the capacitor visually for signs of damage. So the capacitor plays a big role. Inspect the capacitor visually for signs of damage.

Buy when you get up there there are a couple of wires coming off the blower motor. Locate the capacitor inside your appliance capacitors are metal tubes that store an electric charge usually found near a motor in the appliance. The capacitors on most of residential blower motors are very small so technicians tend to overlook them. Faulty capacitors lead to overheating intermittent motor operation humming noises or even outright blower motor failure.

How to test start capacitors on furnace blowers. For example if your capacitor says 50 5 the acceptable capacitance range is 47 5 to 52 5 f. How to test start capacitors on furnace blowers. I dont know how savy you are.

A capacitor helps the motor run and gives it more torque. When the motor generally goes south the motor itself it will trip the breaker. Excessive heat in the motor can cause the motor to malfunction. Remove the wires that are connected to the terminals.

Set your voltmeter to the capacitor setting and connect the meter to the terminals on the capacitor. If you re concerned that your furnace capacitor isn t operating properly you can test it by following a few simple steps. Check the capacitor rating on the side of the unit. If it not you probably have a failed capacitor.

A furnace usually uses a run capacitor to maintain a relatively constant voltage supply to the blower motor. Some capacitors will have a set capacitance with an acceptable percentage of variance.