How should I trouble shoot a blower motor
I have an American Standard Freedom 90 furnace that decided not to work all the sudden. When trouble shooting the problem I found the contact for the MD-LO wire fried itself right off the I.F.C.. It's obvious i need a new I.F.C. but before I install one I would like to make sure the blower motor is working right so this doesn't happen again. How would i go about testing the different stages of the motor before installing the new I.F.C.? Or maybe someone can tell me where else to look for possible problems. Thanks!
You can test continuity/ohms through the wires. The higher the speed wire you test in ohms the less resistance it will show.
I just confirmed the blower motor operation on my furnace.
The schematic showed that the motor works on 120v and what pins controlled what speed.
I hooked up a suicide cord and fed the terminals with 120v, confirming that the motor worked before doing the considerable work of reinstalling it.
Once I knew it worked I checked resistance from each terminal to each of the other terminals so I'd have this info for the next time.
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