Question about Dometic Rooftop RV Air Conditioner

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The compressor kick-in for a few seconds and then kicks-out. The fan continues to run. There is a faint odor coming from the vent and the unit outside. I have no heat nor air

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  • Dometic Master
  • 1,363 Answers

Relay module, compressor going out on safety change capacitors

Posted on Aug 18, 2015

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

22yooper
  • 828 Answers

SOURCE: Fan runs, shuts down on cool

Sounds like a power supply problem. There is enough power to run the fan but when you turn it to cool the current draw by the compressor drops the voltage. The lower power light is telling you the answer to your problem.

Posted on Jul 18, 2008

motor1258
  • 6674 Answers

SOURCE: Coleman rooftop a/c unit, fan runs, compressor come on/off

First of all, Shut off power to A/C unit. !! Next,You need to remove the filter /cover ceiling assy, and with a flashlight, look way up inside and you'll see the cooling fins etc, that look similar to the back of the AC on the roof. If they appear dusty/dirty, then they need to be cleaned. I use a shop vac with a couple of extra extensions to reach, and duct tape a pot scrubber brush (half round or round with nylon bristles) to the extension. Then start as high as you can get on the fins, and come straight down, kind of like combing the fins, but not pressing super ******* them. Move over, and down again, until you get them all, or at least as much as you can. (Thats basically the same as your return air at home) I use the nylon scrubber because the brush attachment with vacuum is usually softer bristles, and doesn't get in there as well. If yours does, great.Make sure you wash out your foam filter in a little dish soap & water before you put inside cover/filter back up. Now to the best part, The upper unit on the roof. You need to remove the plastic cover, by removing the 4 screws holding it on, or if it's dometic type, screws all around near the bottom of the cover, and lift it off. The front of the colemans have a lip that the cover is down over, so you may have to pull cover forward & up, then it should all lift up & off. Here's a spot to be real careful, and ready for wasps & bees. Very few, if any that I've done over the years, haven't had a bees or wasps nest under them, so if you can do it on a cloudy day, or at least be ready to move quick, and have a wasp blaster spray with you, it may be smart. Just don't forget your on a roof when you start moving !! Another thing to remember too, is that the roof can be very slippery when wet, or dew is on it, so watch out!! Be careful !! Now with cover off, look at the fins on back of the unit, and clean those the same way, or spray with a garden hose, and soft brush, and clean them up. Next, look at the opposite side of those coils/fins, where the fan blade is in front of it, and lightly wash it down as best as you can with the hose, spray nozzle, and a brush if possible. Remember when using brush, up & down as much as possible, to avoid bending the fins over. If you can't brush it , just spray it as good as you can, to clean it. Water should not enter trailer, unless maybe if you go overboard with spray, and pressure. If you have access to an air-line to use up on the roof, that's good to, but a lot of times, the water will wash it down better. This will more than likely cure your problem, if you get it cleaned out. At the RV resort where I work as a Technician, we usually have a flat rate of approx. $50 CDN. for me to do it for you. 95% of the time it cures the early cut-out of compressor, and people actually report it cools better than it has for a couple of seasons. It has to be clean to do it's job properly. When those areas are dirty, the upper unit (compressor etc) has to work so hard to cool, it overheats & cuts out, until compressor cools down a bit, then comes back on, until it heats up too much again, and kicks out again. That's why it doesn't do it as much in cooler times, because compressor doesn't get as hot. Your also shortening the life of your unit too.

Posted on Aug 14, 2008

  • 2 Answers

SOURCE: Compresser will not kick in and there a electrical smell

Sounds like your start capacitor may have gone bad. If you remove the shroud, there should be an access panel for the electronics. In there, you'll see one (or two) cylindrical parts with wires coming out the top. If one of them shows signs of something coming out of it, it's probably your start capacitor and it needs to be replaced.

You can view the installation/service manual for DuoTherms here at Bryant RV.com (it's a 3MB PDF file, so download with care). Look on page 28 for info on the capacitors.

Posted on Oct 13, 2008

relaga58
  • 158 Answers

SOURCE: DuoTherm compressor starts but will not continue to run

check condenser fan if running. it will make compressor comes on and off if broken

Posted on Jun 01, 2009

Reeferman
  • 6 Answers

SOURCE: compressor not kicking in when i turn the air conditioning on.

what is the make and model? how long has it been switched on? is the compressor top hot?

Posted on Jun 23, 2009

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It sounds like your unit may have a bad run capacitor or start capacitor and relay. Low voltage will also cause this problem. First you need to make sure that you have the full rated voltages at the unit, if you do, then, have the run and start capacitors checked out and the start relay.

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With rooftop air-conditioning units two issues are commons and that not clean unit that slow the fan and that effect the compressor, check the fan and see if the housing clean and no debris and as far as the compressor it is don and you need to replace it, I am sorry to tell you the news but on the other hand you can get used one now very cheep and they do work good. See if you contact local dealer that serves them and ask for used one or call campaign world and ask them to look for one for you…let me know how that work for you and please do not forget to rate my service so we can improve on it with your help. God bless

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