It may also be that your Start Capacitor has failed. The Start Capacitor provides a boost in power to the compressor when it kicks on, in order to overcome the high power demand on starting. Call Dometic with your unit's model number and they can help troubleshoot and/or supply parts.
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Air conditioner compressor will
not start. When power is applied to the air conditioning outdoor unit
the fan starts, but you hear a sound like the compressor is trying to
start, "UGGG"..., for about 5 to 10 seconds and then all you hear is the
outdoor condenser fan run. The compressor is locked and will not start.
What is happening is the compressor is trying to start, but because the
compressor motor is locked it tries to start for a few seconds and then
because of the high amperage being drawn goes off on internal overload.
The internal overload protects the compressor windings from overheating
and burning up. I see this many times during the start of the air
conditioning season. Some compressors just have a hard time starting
after sitting all winter long. Some compressors are locked up so bad
that I can not start them and must tell my customer that they need a new
compressor . Many times I can get the
compressor started again without having to buy a new compressor using a device
called, "Super-Boost." I keep two or three of these on the truck. They
have saved many of my customers from having to buy new compressor.
it sounds like your compressor is failing to start ... that usually means a bad starting capacitor ... if thats the case it will hum loudly for a few seconds periodically .. thats the compressor trying to start but it cant if the capacitor is bad .. it will stop humming when it gets too hot .. a thermal breaker will turn off the power until it cools back down .. dont let this continue since it will eventually damage the unit ... replace the capacitor .. the capacitor is usually mounted on or near the compressor .. it often has two sections .. one for the fan motor and one for the compressor ... since they are both in one case you have to change them both ,...
The compressor is trying to start and cannot because it is broken inside and will need to be replaced. The compressor can be replaced by most anyone that is familiar with working on home central air conditioning units. I have replaced a few compressors for units like yours. Have a professional check it out. It could just be the start capacitor, but usually it is not.
If you have just installed this unit in your window for the
season, you may want to wait a day or so, for everything in the unit to
settle, and try again. You make have shaken it up a bit too much. If not.....sounds to me like it is kicking out on high head pressure. This happens when refrigerant gets too low, or there is air in the refrigerant system. There is nothing you can do to solve this problem, except take it to a repair shop. If I am correct what happens is you turn the unit on, and the fan and compressor start simultaneously, then after a few seconds (maybe up to a minute) the compressor kicks off, and the air gets warm, then the compressor kicks on for a few seconds, and we repeat. This is actually a safety mechanism for the compressor motor so it does not run without refrigerant. (That would destroy the pump.)
It is probably a failed run capacitor for the compressor. Without the capacitor, the motor can't even try to run, but it will draw extreamly high amperage until it trips the thermal overload (avarage trip time 5-10sec) after it has a few second for the safety to cool off, it will try again. Either that or the compressor truly is seized