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Old 09-17-2022, 07:32 PM   #1
Kenmax
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I have a 2003 conquest motorhome with a duo therm AC. When i turn on the ac it hums and sounds like a motor is locked up.
Any ideas of what it could be would be appreciated
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Old 09-17-2022, 08:22 PM   #2
Life on the fishing pier
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My first load in the parts cannon would be the compressor start capacitor. These give the compressor an extra boost to get started. If they are bad the motor usually just groans until the breaker kicks.
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Old 09-17-2022, 09:03 PM   #3
Kenmax
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Thanks, I am going g to order one for my ac but I can't find one for my duo therm model # 620426.321 . When I find one I will order it and see if that works.
Thanks
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Old 09-19-2022, 07:28 PM   #4
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Whilst your doing that get some ac cleaner and clean coils, etc. and your inside filters if ya got them.
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Old 10-02-2022, 01:30 PM   #5
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1) Fan Motor Bearings seized; 2) mud-dauber nest on fan locking motor; 3) Bad START CAPACITOR. Start with VISUAL on roof, remove cover? See if fan spins freely? If you buy capacitor, buy two, carry spare; often only last 2-3 yrs? Good Luck
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Old 10-02-2022, 01:40 PM   #6
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Turn the fan blade by hand to make sure it is free. If not used often the fan will seize and needs a kick start.
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