Furnace Blower Capacitor Test

A furnace usually uses a run capacitor to maintain a relatively constant voltage supply to the blower motor. Do not do an under load test on blower capacitors due to the risk of the meter leads around a spinning blower wheel. If the system is currently running then an under load test may be best.

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Shut off the power to the furnace at the fuse.

Furnace blower capacitor test.

Bench or under load test. Set a voltmeter to the x1 setting. Remove the blower housing inside the furnace to access the capacitor. Decide if under load or bench testing is best.

If the system is not running then a bench test will be the best bet. If you re concerned that your furnace capacitor isn t operating properly you can test it by following a few simple steps. Remove the wires from the terminal and discharge the capacitor using the instructions included with your furnace. The capacitor will still hold a charge even without power.

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