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Compressor cycling on and off

I have a Carrier Roof AC on my trailer. It was working fine, but recently the compressor will only stay on for about 5 minutes and it cycles off, then after about 4-5 minutes the compressor starts again. It will cycle back and forth like this regardless of lowering thermostat setting. Help?

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Check the relay on the compressor. Also check the capacitor. It iwll be one of two prob lems most likely the relay

Posted on Jun 02, 2009

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I have a Dometic 15K roof Ac on my FW. After the AC reaches therm temp, the compressor and the fan turn off, but the fan starts right back up again and runs until you set the thermostat on off.


That is normal operation, only the compressor cycles, the fan stays running to keep air circulating for better temp control. Otherwise the rear of the space could get 5 degrees warmer than the front

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My Dometic AC on my travel trailer cools well but I cannot set the fan to stay on when the compressor cycles off. Can a different switch or board be installed to allow the fan to stay on?


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well most unite will go to 54 degrees but 43 that coooool man what complain about. the compressor dose shut down at certain temp so as not to turn into one hunk of ice. that what they are design to do.

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There are a couple possibilities:

1. If this is the first time you've started them for the season, one of the compressors might be seized up from sitting over the winter. In which case, new compressor required.

2. If you've just had the compressor serviced including recharging the system, it's possible that the system is simply overcharged. This will stop the compressor from working and giving you the same symptoms as above. If this is the case, you should have the service people come back with some guages and recover some of the refrigerant and the compressor should be fine.

3. If the unit has been sitting and there is a slow leak then there is not enough pressure in the system to allow it to run. The compressor will shut down if there is not enough pressure, but since you say there is a smell, i really doubt this is the case.

Most likely it's #1 or #2 above. If you haven't had it serviced recently, then yeah, it sounds like you're in need of a new compressor.

Good luck.

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