My Dometic ac unit will not cool.The fan runs but the compressor does not start.I an hear a light click as I turn the cooling knob to the colder setting.I replaced the start capacitor with a hard start capacitor but it did not fix the problem.There does not seem to be any power leaviny the run capacitor going to the compressor?

DuoTherm by Domestic-Fan runs, no cold air - iRV2 Forums

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Jan 22, 2012 - 12 posts - ‎4 authors Duo Therm by Dometic 13500 BTU air conditioning with ducting, furnace. I. ... If the fan runs but no cold air and the compressor feels like it is ...

A/C just stopped blowing cold.....any ideas??! - RV Forum

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Jul 27, 2008 - 23 posts - ‎6 authors We have run it continuos like this before without any troubles. Thanks for the help! ....When you switch the AC unit on, the fan runs, but the compressor doesnt fire up. You used to be able ... You can find Dometic here. Logged. Dometic Duo Them Air Conditioner Cycles
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Hi,

If the refrigerator isn't cool, you need to answer some questions, then see if the compressor is running.

First, answer these questions:

• Is the refrigerator completely dead? If so, see “It's stopped completely.”



• Is the thermostat knob turned to the proper setting? If not, reset it.

Next, see if the compressor motor is running

The compressor is a football-sized case with no apparent moving parts. It's on the outside of the refrigerator at the back near the bottom. If it is humming or making a continuous noise and your refrigerator is still not cooling, there may be a more serious problem with one or more of several different components, we recommend contacting a qualified appliance repair technician for further help.

If the compressor is not running but you do have power to the refrigerator, there may be a problem with one or more of these:

• The compressor



• The Thermostat



• The overload, relay, or capacitor



• The defrost timer



• The condenser fan motor

shut unit off and wait at least 5-10 minutes before re-starting. do not want compressor to struggle to start. good luck!

the heat and cool use the same fan. if compressor is running with heat then you have relay issue

Please reply with Model number of bottom of AC unit ( upper) . Can be seen from inside usually. Thermostat model, plus if controls are at the ceiling assy or at thermostat on wall.

Usually just listening closely will give you a rough idea where to look for problem. When you have the fan on and switch to cool, (with temperature turned down low obviously) do you hear any type of "moaning" sounds from AC unit, or see lights in RV dim slightly indicating that compressor is trying to engage? Is the breaker tripping when compressor tries to engage? Do you hear a "click" from AC unit when switched to cool? If none of that happens, then I'd start thinking thermostat, or compressor relay. Normally if it's a faulty capacitor, the compressor will try to engage but will make a "moaning sound" and usually trip the breaker due to excess current draw. Someone experience in electrical should be able to test relays etc, but whoever does work on it, should be aware that those capacitors, as well as hydro in general are very dangerous to work with. The ("zap",- Shock) that you can experience from a capacitor or hydro, can be fatal.

The compressor coming on does make a slight "humming" sound which is normal. Is the unit cooling properly? Do you think it is louder than before?

It could be the capacitor, it could be a loose wire connection, it could be a delay switch or a contactor/relay.

Let it cool off.Install a hard start kit on the run capicator.Its only 2 wires & easy to put on.It should kick over.

Try moving it out so that you can get to the back of it. You have power as the lights work. Here are a couple of things to check. There is a fan motor with a blade on the shaft. Turn the temp. control down so unit will cycle on. See if this condenser fan motor is running. If not, it has burn out. If it is running, check to see if you can hear the compressor pot running, You will be able to hear it come on when you turn the control down to colder.Please don't turn the control up and down, as this will cause the compressor to short cycle and lock out on overload. Wait about 5 Min. between moving control knob. If compressor doesn't run, it could be the start relay, or you have lost the compressor. There are many things that can go wrong, but these are just a couple you can check out yourself. Condenser fan motor you can replace yourself. I hope this gives you a place to start.

Good Luck, Sincerely, shastakaker7

ps Always unplug unit before replacing any parts.