I have a Dometic Cruisair STQ16 A/C in My Salon. The other day, it was in cool mode and quit normal operation. I found it was showing 98 degrees on the Thermostat, the water pump and fan were running and water was flowing, but the compressor was not running and it was not cooling. the actual inside temp was around 55 degrees. I turned the unit off. I turned the unit off and then turned it on to the Auto mode. The heat cycle kicked on and everything operated normally and it began heating the salon to the set temp of 70 degrees. The following day, the unit kick off again and the compressor was not running, but the fan and water pump were running.

What I have found... When i turn the unit on everything seems to work as normal, the fan comes on, I then hear a click and the water pump starts and then I hear a click for the compressor, however the compressor does not start. Water flow is good, and there is no air handler blockage. I have ran both a low and high pressure switch test at the controller and both report ok and no errors. From what I understand, it the unit is low on freon, I should get an error from the low pressure switch. I also did a system reset at the controller, but no change in condition.

It problem appears to be related to the compressor, does anyone have an ideas on what to look for next?