Here is a little more info on my problem; this could get a little wordy but I could really use the help. My sys is a factory installed Dometic Brisk 2.
I dropped my camper off to my dealership (3 hrs away from where I live) about a week ago, they trouble shot the sys, got with Dometic and decided to change the main unit under warranty; the t-stat & the control board had already been changed prior to this. I picked the camper up and spent the night at a nearby campground to test the system.
The a/c worked fine for about 7 hours, turning on & off maybe 10 times as it should while maintaining 75 degrees which was what the t-stat was set at. Then the cycling started again, just as it had before the unit was replaced. The sys was off for about twenty minutes, the fan came on for 1 minute, turned off for 1 minute. It did this on & off cycling about 5 times; then the compressor would come on and ran until the temp hit 75 and then turned off. Twenty or thirty minutes later, it did this same cycling of the fan on & off 4 or 5 times, then the compressor would come on and cooled the camper down. Then the system would run correctly ( fan on, 10 or 15 seconds later the compressor came on, cooled the camper down and turned off). It is a random issue; the sys may work correctly 5 or 20 times and then mess up for a couple of cycles and then work correctly again.
Background info; I had two mobile techs look at it, the dealer where I bought the camper plus I have 7 years of experience on residential air conditioners systems. The following is the sequence for what has been looked at or replaced. We had good voltage & amp’s (110 & 12 volts) at the unit when it comes on, replaced the t-stat, control board and then the a/c unit itself. It's not a dead band or delay issue and there is no remote sensor in the system. When it starts the cycle issue, the compressor just doesn't attempt to start (no LRA) until the fan cycles a few times.
This has all of us stumped. Dometic thinks a dirty power issue.
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