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Old 03-28-2013, 09:39 PM   #1
GPR
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Air Handler ECM Motor


I have a Carrier Air Handler (the inside unit). The blower motor will not start. It does not seem to rock back and forth. It spins freely by hand. A tech came out with a tester and ohm meter and pronounced the motor as bad. He wanted half my monthly income to replace it.
This is a two part motor. The actual motor and the module which is contained in the bottom of the motor.
I have taken them apart. I see no signs of damage or burning on the module. The motor ohms between each of the 3 input wires are all 11 ohms and to the case are open. I think this should mean the motor is good.
Everything that I read online seems to say that it is almost always the module that is bad.
I can get the complete unit (motor and module) for a third of the price I was quoted although I may have to buy a puller to get the motor off the fan. The module by itself is about 1/10 the price I was quoted. Some people have said that the module must specifically match my air handler. I am a bit confused as to why since it is the part number that goes with my unit.
So my dilemma is do I go with the cheapest and easiest possible solution or the more expensive but difficult to do solution.
Anyone have any ideals?

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Old 03-29-2013, 06:11 AM   #2
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Air Handler ECM Motor


Sounds like you need a module as yes is needs to be the exact replacement for that unit.Either order by the model and ser # off unit or by numbers on the module it self .Carrier is allways updating part numbers so you need current replacement #.Probably a RMOD****** .

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Old 03-29-2013, 12:27 PM   #3
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Air Handler ECM Motor


yep, motor is good with those readings. The correct way to test for operation is with a techmate to determine if it is the module or control board.
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Old 03-29-2013, 12:39 PM   #4
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Air Handler ECM Motor


Take another real close look at the thermister on the module. It usually looks like a nickle or quarter that's encapsulated in black plastic and soldered to the module. Is it split or swollen? If so, then replacing the thermister might be a worthwhile try.

Last edited by how; 03-29-2013 at 12:45 PM.
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