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Old 08-30-2019, 09:59 PM   #1
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Rooftop Dometic crazy

Was working fine when we towed her home a year ago. Tried testing the roof top a/c heat pump today and it shakes the roof and and makes a very loud vibrational racket as if it was missing a cylinder. Any ideas?
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Old 08-30-2019, 10:29 PM   #2
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Can you safely go up and take the cover off to look inside? Sometimes mud daubers like to nest in there. Could be a nest on a fan blade sending it way way out of balance. Worth a look.
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Old 08-31-2019, 01:01 AM   #3
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if you do go up take a can of wasp spray with you and watch from afar, they will be Pi---d
off to have the home doing 2500 rpm ?.
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Old 08-31-2019, 05:39 AM   #4
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Had a similar issue and found a huge tree frog bouncing around off the fan. What a mess.
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Old 08-31-2019, 06:03 AM   #5
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YEP...Them daubers love the "mouse wheel".

I soak the nest so I don't damage the blades.
After the first time it happened I had some straightening to do.🥴

POI...they also like the exhaust tube of the furnace 🦟

Bob
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Old 08-31-2019, 08:13 AM   #6
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I'm going with the mud wasp. Climb up there, stay on the seams (follow the rivet lines), don't crawl on the endcaps, and remove the a/c shroud. Locate the squirrel cage fan. Look real close because some times they are hard to find. Probably attached to the inside of the fan wheel some where.

The one time I had this issue I removed the mud nest with a thin screwdriver.

With that being said, it could be something else, but in my experience the old mud wasp would be the first thing to check for.
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Old 08-31-2019, 02:12 PM   #7
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Thanks all. I’m hoping it’s that simple. Will check when I can get up top.
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Old 08-31-2019, 02:32 PM   #8
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Quote:
Originally Posted by Pimms View Post
Thanks all. Iím hoping itís that simple. Will check when I can get up top.
I'm going out on a pretty fat limb...and saying that's your problem.


Also, you can take off the shroud without getting on the roof. Just do each side at a time, leaning a ladder against the trailer with a towel or blank or foam pull noodles or whatever, protecting the trailer.
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