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Old 09-23-2016, 09:54 AM   #1
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Question Dometic heat pump rattle

We have a 2015 Aframe, and sometimes when we start the heat pump on AC, it makes a pretty loud rattle sound, like maybe a bad bearing. I thought maybe we were starting it up too soon after transport, not allowing the coolant to settle, so on a recent trip, tried to allow it to settle before starting. This time, the rattle happened after it had been running a few hours, but not as loud. Any ideas before we consult an HVAC person? Thank You
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Old 09-24-2016, 07:37 AM   #2
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I forgot to mention the noise goes away and usually doesn't come back until the camper is moved. The noise also reminds me of the sound an automobile heater fan makes when something soft has gotten in the housing. I would take it apart and look, but my muscular dystrophy limits my ability and my husband is away working so I thought I would see if any of you had the same problem. Thanks.
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Old 09-24-2016, 08:17 AM   #3
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The heat pump/AC in our rig will sometimes start making a rattling sound after an hour or so of AC operation. This happened on my last MH also. I always assumed it was starting to freeze up a bit. I never investigated the problem as it always seemed to work properly.
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Old 09-24-2016, 09:42 AM   #4
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Thanks hoppers4. I think sometimes it happens right away. We do have the fan on high and running constantly which I think helps prevent freezing.
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Old 09-24-2016, 09:44 AM   #5
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Maybe I should mention that this is not a rooftop or through the wall unit. It is under the bed with flex duct to the outside.
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