Constant ac problems

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Old 08-07-19, 06:55 PM
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Constant ac problems

Hey everyone,

looking for for a little help. I have a trane gam5a0b30m21sab that was built in 2013, and have had constant problems the last year. The most recent issue I have is that the coils are freezing, I had a company check refrigerant level and it wasnít only about a pound low, Iíve checked to see if the coils were dirty and theyíre pretty clean. One thing I noticed today is that the blower will run for a minute or two and then stop running but everything else sounds like itís still running which is why I think the coils are freezing. When looking around at the blower I do hear a humming noise so not sure if itís a capacitor. The motor on the blower doesnít seem hot either. Any help would be greatly appreciated.
 
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Old 08-07-19, 07:16 PM
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Welcome to the forums.

The system charge has no affect on the blower. If the blower is stopping...... the coil will freeze.
You need to determine if your blower uses a capacitor. If it's a high efficiency unit.... it may use an electronic variable speed motor.

On further checking..... your air handler does use an ECM motor. There will not be a replaceable cap. That is an expensive motor and be under warranty on your unit. The link is the motor.

ECM motor
 
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Old 08-07-19, 07:29 PM
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Thank you for the reply, luckily my warranty expired about three months ago. Is there any way to directly test the blower to determine if it actually needs replacement?
 
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Old 08-08-19, 04:22 PM
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So I replaced the blower with a new one, but it seems the blower is not pushing much air even still.
 
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Old 08-08-19, 04:30 PM
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Was it the ECM type motor ?
The motor should have been $500 or more.
 
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Old 08-08-19, 04:44 PM
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Itís the mot13906, verified that I replaced the same model. Was $219.
 
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Old 08-08-19, 05:02 PM
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The buzzing noise is still coming from something though itís a basler electric class 2 xfmr, appears to be a transformer.
 
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Old 08-08-19, 05:58 PM
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A buzzing transformer is not abnormal..... annoying though. It's possible it's not mounted tightly. Try rapping on it with a screwdriver and see if the hum changes.

Did you give the place you bought the motor the full model number ?
I believe the motor needs to be programmed for a particular unit.
 
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Old 08-08-19, 06:20 PM
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Yeah I did. Appears to work better than the last one just not putting out a lot of air for some reason.
 
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