Rooftop Dometic crazy

[Pimms]

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?

[rowiebowie]

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.

[Wolfe]

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 ?.

[Sneakinup]

Had a similar issue and found a huge tree frog bouncing around off the fan. What a mess.

[ROBERT CROSS]

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
🇺🇸

[majorairhead]

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.

[Pimms]

Thanks all. I’m hoping it’s that simple. Will check when I can get up top.

[pcskier]

Originally Posted by Pimms

Thanks all. I’m hoping it’s 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.