Question about Dometic Rooftop RV Air Conditioner

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Fridge not cooling

Dometic rc1600 3way fridge not cooling back side feels hot do u think it needs more NH3 coolent/refrigerent

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If you look in the outside compartment do you see a yellowish powder? If you do, or if you smell amonia probably the cooling unit has leaked the coolant. It does not help to add coolant, it will just leak out again quickly. You will need a new fridge or to have the cooling unit replaced. If that is the problem, Dometic has a recall on some models for leaks and will pay for a new cooling unit.

Posted on Jun 16, 2008

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2014 Dometic Brisk II 15,000 unit won't cool below 88 degrees


Check the unit to see if the outdoor fan and compressor are coming on. If not, check to see if power is reaching the contactor, both the high power contacts and the low voltage solenoid. Some contactors can be manually actuated, and a quick press (with a NON CONDUCTIVE ITEM) can show you if the contactor is engaging. If the solenoid is not working, check the wiring of your thermostat. When set to cool mode, there should be voltage on the solenoid of the primary contactor, sending power to the outdoor fan motor and compressor.

If the outdoor fan and compressor engage normally, then make certain the coils are free of debris and other blockages. If air flows freely and the compressor is running, feel the tubing for temperature changes. One side should grow cooler and the other warmer.

If the compressor runs but there is no temperature change, take your unit to a certified technician to check for leaks and system pressures. Roof top units typically use R22 refrigerant not R134a automotive refrigerant, which require EPA certification for purchase and dispensing.

Jun 25, 2014 | Dometic Rooftop RV Air Conditioner

1 Answer

Unit blows cool air for a short period then blows hot air , like it changed to heat pump mode


It sounds like the unit is low on refrigerant or a safety is saying so. You need a diagnostic run.

Sep 09, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a Duo Therm Quick Cool High Efficiency by Dometic in my trailer. The air conditioner is blowing air and not cooling. The compressor seems to be working, do these units leak freon and if so, does...


Any refrigeration unit 'can' leak, and 'no' that does not 'usually' mean you need a new unit. "Never say Never."

Actually, a 'refrigerant leak' is a fairly rare occurance and I would suspect that you probably do not have one.

You say 'the compressor seems to be working.'

Is it running?

Note; a good way to tell if the compressor is running is - by hearing it's distinctive 'rumble sound' when it's running - or by feeling of the compressor with (a) a screwdriver pressed against it to feel the viberation or (b) by holding your hand (be careful if you do this - it could be hot) against the compressor to feel if it's running or not. NOTE: ALWAYS BE EXTREMELY CAREFUL PUTTING YOUR HANDS INTO AN AIR CONDITIONING UNIT THAT HAS "LIVE POWER."

Once you've established that it is running - you can 'kind of sorta' determine how well it's running by the 'coolness' of the air coming out (which you've already said was not cool) or by feeling of the suction line (the bigger of the two copper lines going into the compressor/usually wrapped in black insulation). The suction line should be 'cold' to the touch (note: if it's wrapped in insulation - just peel back enough to get your fingers on the line to feel how cold it is).

I'm guessing your compressor is 'not running' and you are thinking it's running because the fan motor is running and hiding the distinctive sound of the compressor.

If it's not running then you are dealing with an 'electrical/control problem, or an internal (mechanical/electrical) problem with the compressor, in which case you will probably need to consult with an Air Conditioning serviceperson.

If - the compressor is running 'and not cooling' then you probably do have a leak - which also will require a serviceperson to 'find the leak and repair it - and then re-charge the unit.

Note: Things you might do "if the compressor is not running."

1. turn off all power and check for 'wires burnt off any connections - especially the compressor terminals.'

2. make sure both coils, (evaporator/condenser) are clean and you have good air flow
across both of them.

3. make sure your compressor - capacitor is good. Note; about the only way you (layman) can determine this is 'if it (capacitor) is 'bulged.' If it is - then chances are it's defective.

Jun 16, 2011 | Dometic Rooftop RV Air Conditioner

2 Answers

My air conditioner keeps icing up and the flow is then reduced and cooling is diminished. I was recently in a very hot area and the AC was working very hard. I'm in a more reosonable temperature now but...


Check the filters and make sure the coils are clean first. Then make sure both fans are running, the evaporator fan and condenser fan. If all of that is ok then you need to get the refrigerant charge checked.

Jul 23, 2010 | Dometic Rooftop RV Air Conditioner

2 Answers

How do they rechares the unit.


They would probably have to put on saddle valve ports, make sure
they leave them on.

Jul 19, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Just bought a used 1987 Real-Lite truck camper. The roof air unit is Dometic as well as the LP/AC refrigerator. When turned to "cool" the air conditioner really draws down, dims the lights, and eventually...


To start with, if it's plugged in to a 15 amp breaker, and extension cord, the compressor starting up may just be enough to trip the breaker. It will draw close to 15 amps on start-up of compressor, and if there is a light extension cord used to plug it in, that only makes it worse. Make sure you shut all other breakers off in panel except AC, and try it. If you have water heater on hydro, fridge on hydro, and then try to start AC compressor, you'll be way over the 15 amps, especially if it's a light extension cord.
Keep in mind, in order for fridge to work, you need 12 volts DC (Battery) power going to back of fridge. If the controls aren't lighting up at top, you've most likely got no 12 Volt DC power going to fridge. Check all fuses as well.

Jun 02, 2010 | Dometic Rooftop RV Air Conditioner

2 Answers

Air not cold enough to cool house


Make sure the outside fan is running. Also check the high side pressure, I assume the 70# is the low side pressure, so you can tell what the compressor is doing. If the fan and compressor are both working, make sure there is good airflow through outdoor coil and check that it is clean. Let me know what you find.

May 17, 2010 | Goodman CLJ24AR32 Air Conditioner

1 Answer

Dometic Quick Cool compressor freezing and evaporator coil


Could be low. First check air filter, air flow, and evap coil to see if it has restricted airflow. If all seems well, its probably low. The specs will tell you what type and how much refigerant. To access system, you will need a gauge/manifold set, refrigerant, and a piercing or line tap valve for the low pressure side of the system. Of course, first, you need to locate and repair the refrigerant leak.

Jul 27, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

System will cool for a period of time then will start blowing hot air


Refrigerant leak. You will need to have someone charge the unit, find and repair the leak the leak (It is the law and then must have an EPA air conditioning license)

Apr 26, 2009 | Dometic Rooftop RV Air Conditioner

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