Question about Dometic Rooftop RV Air Conditioner

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Dometic ac and fan in my 5th wheel does not come on. worked for a bit then shut down. fuses okay and breaker not tripping. can hear relay clicking when you operate controls. any idea where to start trouble shooting?

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There should be power to one leg of the relay all the time. The relay is just a high voltage switch, the trigger engages the relay and delivers power to the leg that goes to the compressor.

Try jumping the low pressure switch to see if the compressor engages. Don't do it for long, if the refrigerant is low, the oil won't circulate properly and it can damage the compressor.

If jumping the pressure switch engages the compressor, check the refrigerant level. Best left to someone with a set of manifold gauges and the knowledge to use them. If the switch isn't activating, the Refrig level is very low [usually only takes around 4 ozs to kick it on, the system holds around 24 ozs].

Switch should be on the receiver/dryer. Follow the the ac lines and you'll find a aluminum can with two refrig lines going in and a plug on it. You jump the plug, not the switch with a piece of wire or anything conductive that you can get in there.

If the refrig level is good, I'd suspect the low pressure switch next.

If the refrigerant is that low, there is probably a leak. You can get a small can of refrigerant with uv leak detector in it and a uv pen light at any auto parts store. Follow the directions and check all the connections, hoses, the compressor shaft seal [if that's leaking, there will be oil on the bottom of the compressor too]

Posted on Aug 01, 2010

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1 Answer

The Dometic ac.heat pump is not providing cold air. What are the possible causes and fixes? It is about 6 years old.


Could be possible, but normally when a capacitor goes, the compressor will try to kick in momentarily, then back out and when it does, it will draw a lot of current, and likely trip the breaker, or at least draw current down, and make lights in trailer dim momentarily as well. Can you hear a "click" (relay makes that sound) when you go from fan only, to cool on that AC unit ? It almost sounds like a faulty relay, if no current draw when switched to cool. I don't suppose you have a multimeter of any kind?

Aug 06, 2010 | Dometic Rooftop RV Air Conditioner

2 Answers

My unit was working fine until 3 days ago when the breaker tripped, I reset the breaker and worked fine for a day then tripped again when it tripped both the ac breaker andthe main in the trailer as well...


High amp draw can be caused by a few different things, so first check that incoming voltage to trailer is sufficient. (115 volts) Not unusual for some parks to install more hydro hook-ups on a feed line, and when all are up and running, your incoming voltage could be decreased. If your o.k. that way, then I'd start looking at the compressor circuit of your ac, in particular, the compressor start-up capacitor. The capacitor basically stores electricity and boosts it to higher voltage for compressor and fan start-ups to reduce current draw that will trip the breaker. Please have a knowledgeable electrician, or RV tech check this for you, as a capacitor can give a real good high voltage (possible fatal) shock, even when power is off to unit. I also suspect that the start relay has shorted (welded) itself due to high amp draw situation, and that is reason it comes on by itself.

Jun 21, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

My Duo-therm Brisk-Air by Dometic rv ac wont cool.(The fan runs )


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.

May 27, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Turned AC thermostat to Cool today - AC didn't come on. The last time we used AC (March 2009) it worked fine. I can hear the AC Relay Board, inside the trailer, click when switching from Cool/Off &...


Just clicking is all your getting from ceiling assembly? No other modes work such as fan, or furnace? If that's the case, check your circuit breakers to make sure it didn't trip.

Jul 28, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a Dometic Duo-therm 1500 AC Model 59516.633C1 on my 5th wh


The clicking sound is usually the relays in the control unit making or releasing. When they click does anything turn on? Check the control unit that is located inside the lower unit of the air conditioner. Remove the cover and listen for the clicking sound. If it sounds as if the relays are clicking, try removing power from the thermostat and see if that stops it. There are three relays on the board, one is the compressor, one is the fan relay and the other is for heat. See if you can pinpoint which one is clicking and go from there. It is either that you have a bad thermostat or a bad relay board.

Jul 05, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

My duo therm roof top camper air conditioner just shut off and will not come back on. Can hear a click when turning on now but nothing else. Note that heater will not come one either.


The click that you are hearing is the relay control board in the rooftop unit. This means that you are getting 12V to the board. It sounds like you are not getting 120V to the AC unit. Check the breakers in the breaker panel to make sure they are OK. If they are fine, then turn off the AC for 5 to 10 minutes and try again. There is a thermal protection device in the unit that prevents you from turning it right back on after a shut down. Try putting the thermostat to fan only operation. If the fan does not come on in fan only mode, then you have thrown a breaker.

Hope this helps,

Jeff

Jun 27, 2009 | Dometic Rooftop RV Air Conditioner

2 Answers

Compressor on ac unit


It could be a relay for the compressor is sticking in the run position.
If it is only about one week old take it back to the dealer for service or call them and tell them your problem. This should be covered by warranty and the dealer can refer you to someone authorized to do the work.

Jul 08, 2008 | Dometic Rooftop RV Air Conditioner

4 Answers

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my duo therm air works beautifuly all day but at night when we go to bed it seams to turn on and shut off rapidly. what could be wrong?

Jul 06, 2008 | Dometic Rooftop RV Air Conditioner

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