The capacitor is easy to fix and you can do it yourself. Another problem that causes this situation is that the compressor in your AC unit has malfunctioned or broke in some way. That means you need to check your capacitor to make sure it was not defective or that it just simply broke. Usually, a young air conditioner will not have a broken capacitor so soon but when you start feeling warm air coming out of your AC unit, then check the simple solutions first. Now while some AC repairmen may dismiss this cause if the air conditioner is under 9 or 10 years of age, that doesn’t mean it cannot happen. Usually it can be a broken capacitor that stops your AC unit from blowing cold air and lets it blow warm air instead. What causes this to happen is not that difficult to diagnosis. For the icing issue, it may be a failed ice detector monitor which would need to be replaced as well. To fix the first problem, you need to find out where it is broken and then take the necessary steps to get that part fixed. Or you have an icing problem which when it takes place, will stop the AC unit from producing any cool air. Two other sources could be that the compressor is broken and has stopped producing cold air. But before you reset the thermostat, let the compressor cool down for about 5 to 10 minutes before starting the air conditioner again. Pressure will build up in the compressor causing it to shut down the cooling unit. Trying to go from, for sake of argument, 90 degree interior temperature to a 70-degree interior temperature is too great a gap for the unit to function properly. To start, you just have to raise the thermostat setting a little higher, maybe 10 degrees higher. The solution for the second problem is just as easy and as cheap. ![]() Then your air conditioner should work just fine. To fix the first problem, all you need to do is reset or replace the fuse. When this happens, the fan may continue to blow but without the cool air you want. This causes the compressor to overwork and eventually shut down. When the fuse blows or trips, the AC unit does not have the power it needs to keep running.Īnother source may be that you or your spouse, etc., have set the thermostat too low. That way 100% of the cool air will be directed towards the bunk ends and the system will function as designed.There are many issues that can keep your Dometic AC unit from blowing cold air. So, the solution I've been meaning to try is to get some metal duct tape, fold it length wise and really seal up the return air side of the box. So, that blast of cool air from the other side of the airbox is likely hitting that wire probe for the thermostat and making it "think" that the room has cooled down sufficiently, therefore it shuts down the compressor. I'd bet you'll feel ice cold air there coming directly through the cracks from the cool side. Put your hand just inside the return air. Try this: Remove the filter and grill and then crank the ac up. I think there is enough positive pressure created in the cool side of the airbox that ice cold air gets pushed through the gaps directly back into the return air. ![]() Now that I have the airbox re-installed it has trouble keeping up during the day. I actually ran my AC for a couple of weeks off and on while I was working in the trailer without the airbox on and it made the trailer almost uncomfortably cold without it even on very hot afternoons in full sun. I think the airbox on my Dometic Brisk Air creates a lot of back pressure, since it forces a large volume of air through those two little vents.
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