Furnace Blower Capacitor Test

If the system is currently running then an under load test may be best. Remove the blower housing inside the furnace to access the capacitor. A furnace usually uses a run capacitor to maintain a relatively constant voltage supply to the blower motor.

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Shut off the power to the furnace at the fuse.

Furnace blower capacitor test.

Decide if under load or bench testing is best. Set a voltmeter to the x1 setting. Remove the wires from the terminal and discharge the capacitor using the instructions included with your furnace. If the system is not running then a bench test will be the best bet.

The capacitor will still hold a charge even without power. Do not do an under load test on blower capacitors due to the risk of the meter leads around a spinning blower wheel. If you re concerned that your furnace capacitor isn t operating properly you can test it by following a few simple steps. Bench or under load test.

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