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Old 08-15-2012, 04:23 PM   #1
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Roof A/C issues

The roof a/c on our 89 Winnebago Chieftain hums when turned on. We checked the fan. It's not seized. It spins easily. We have looked at it from inside the rv and from the roof. Everything on the unit looks clean and there is not a burnt smell. Any advice is appreciated.
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Old 08-15-2012, 07:07 PM   #2
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If it is not seized then the start capacitor is suspect #2 on the list (you have eliminated suspect #1).
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Old 08-15-2012, 07:09 PM   #3
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I had the same symptoms (loud low hum) when running but it would run. Fan would spin. Eventually it started to trip the breaker. Pulled cover and found a dual run capacitor had blown its guts. Replaced it and no hum.

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Originally Posted by rlewis9226 View Post
The roof a/c on our 89 Winnebago Chieftain hums when turned on. We checked the fan. It's not seized. It spins easily. We have looked at it from inside the rv and from the roof. Everything on the unit looks clean and there is not a burnt smell. Any advice is appreciated.
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Old 08-15-2012, 08:03 PM   #4
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Your description of the problem is a little ambiguous. Two questions: is the unit cooling at all, and by 'spins easily' do you mean that the fan runs normally under its own power? The hum could be a compressor that won't fully start, or a compressor that is stuck on. In the former case the unit won't cool and in the latter it will, but the compressor will remain on after the fan turns off and thus seem to hum.

If the unit is cooling and the only way you can stop the hum is to turn of the circuit breaker then it sounds like your compressor is stuck on (this can happen if you have a bad relay control board or compressor control relay.) If either the fan or compressor (or both) won't start and you are seeing no cooling then the start capacitor is certainly suspect.
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