When I turn it on fan or ac it rubs the styrofoam housing. I have spun it by hand and I can see that it doesnt rotat in a balanced manner.
SOURCE: will not shut off
Sounds like a stuck relay on the unit itself. Maybe there is a short in the control wire that comes from the thermostat that activates the fan.
The thermostat probably has one hot wire at all times. The thermostat then chooses which wire to send the voltage down based on your selection. One of those wires is probably for the fan only. Make sure that it is in good condition (no bare, pinched or wires)
SOURCE: Dometic A/C Vibration
sounds like the fan bearings are on the way out , these units are designed to be removed to be opened and usually they op from the part that touches the roof of the car not the top so remove it first might be a start
SOURCE: My dometic 15k brisk-air cont. cycles on-off
Actually, the dealer is somewhat correct. In the hotter months of the summer, the rooftop units have a tendency to freeze up if not run on high cool due to the lack of air movement across the evaporator. If the unit fines on High/Cool, then run it in that mode but adjust the thermostat.
It should not however, cycle on and off that fast unless you have a bad freeze switch or the incoming AC is too low. If during that 8-10 seconds, the air begins to get cold and then it shuts off, then I would say you have a bad freeze switch. If it runs fine on high, but shuts off in low, I would say it is a lack of air movement.
Hope this helps,
Jeff
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SOURCE: I have a Dometic 579 Series Brisk Air AC.
My sheet shows part # 3100248.420 as fan run capacitor.You may have an updated number. Check voltage outputs labeled on it are same as on old one, and double check wiring is correct, to and from capacitor. Be careful not to mistake compressor start capacitor as well. By sounds of number, it's probably the right one.
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SOURCE: dometic Duo Therm AC Brisk Air 13k btu not blowing cold air
you can buy a saddle valve, this is a valve you screw in. I am assuming you have the correct freon as where you purchased your freon they should sell the saddle valve. Hope this helped
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