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Control board on ducane furnace blows when turned on

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Either high temp switch is bad, check with electric meter for continuity, should be open until it reaches 160 degrees, or control board fan relay is stuck on.

Posted on Nov 26, 2014


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Posted on Jan 02, 2017

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SOURCE: Ducane Furnace; AC condenser runs

The blower motor could be bad or the motor run capacitor may be bad. If you have the proper tools you can test the run capacitor yourself and replace it.

***CAUTION*** Anytimeyou are working on or around electricity you run the risk of shock and ordeath. Please consider consulting an expert before you open an electrical panelor appliance. ***CAUTION*** Capacitorshold a large electrical charge and will discharge upon contact with your skin.This is enough to stop your heart and cause death. If you are not confident ofyour abilities around these devices then please leave any testing or repairs toa professional. The capacitor is inside the unitand you have to remove the cover to see the inside of the electrical compartment.You will need to discharge the capacitor before you start working around it. Todo this take a screwdriver or other long metal tool with an insulated handleand cross both terminals on the capacitor to ground. You then remove both wiresgoing to the capacitor terminals, which on fan motors are typically brownwires. Capacitors are rated in MicroFarads (marked by a µF symbol) and have a voltage rating as well which istypically 370 volts or 440 volts. Youmust have a multimeter that can read micro farads to check a capacitor. You do that by placing one probeon the one terminal and the other probe on the other terminal and it shouldread the number of the rating, for example if your capacitor is rated likethis: 7.5µF then the fan rating should read 7.5µF (seven and a half MicroFarads). If the reading is more than 6% lower than it is supposed to be, thecapacitor is weak and needs replaced. If you read 0 (zero) then the capacitoris bad and needs replaced. Take the old one with your to match up at your localhvac supplier. A typical motor run capacitorrated at 5 µF +-6% at 370 Volts ACshamoke_0.jpg

Posted on Jun 18, 2011

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