Question about Ruud UBHC Air Conditioner

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I have a Ruud 90% furnace (18 yrs.old) Several days ago, I had a complete ice-over of the evaporator coil. Filters are clean, and airflow unrestricted. After defrosting coil (48 hrs.) while testing, I note that the blower only runs for 30-45 sec. before shutting down. When I set the stat to "fan on", it does the same thing. It seems to me that the blower never gets up enough speed (might be my imagination). I'm assuming that the problem is not in my stat or wiring. Does this sound more like a problem in the control module, the blower capacitor, or the blower itself. The blower turns freely by hand. Any help would bemuch appreciated. Thanks, Jim

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The motor shutting off after 30-45 seconds means it is probably getting hot and shutting off on thermo overload safety in motor. Two things can cause this: #1 is the motor is defective. #2 the run capacitor has gone bad. If you want to try and save money replace the run capacitor 1st and try it. If that doesn't work replace the motor. You would replace the run capacitor at same time anyway.

Posted on Jun 23, 2009


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