Tip & How-To about Dometic Rooftop RV Air Conditioner

Efficiency of RV Rooftop Units Deteriorating???

If the overall effectiveness of you RV Rooftop AC seems to be much less than the day you bought, here is a simple procedure to keep it running cold and prolong the life of the unit.

Problems:
1. Air seems to not be blowing as cold as before
2. Compressor trips breaker during the hottest part of the day
3. Air at night works just fine but is lacking during the day

These problems can often be solved by simply cleaning out the condenser coil of the upper unit. You will need a phillips screwdriver and a water hose with a nozzle on it.

- Remove the upper shroud from the unit
- Gently spray water through the condenser coil watching from the fan side. BE CAREFUL, do not spray with too high of pressure nor sideways. Make sure you keep the nozzle spraying directly at the coils.
- Once the water begins to flow clearly through the condenser, you should be good to go. Make sure you get as much of the condenser clean as possible.

This will save the life of many RV Air Conditioners.

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Related Questions:

1 Answer

RV. when furnace is turned on , fan on rooftop AC unit runs continually


i would say its the relay board or communication cabl between stat and board.

Jun 18, 2014 | Dometic Rooftop RV Air Conditioner

1 Answer

Hi my Dometic rooftop (1999) used very little worked perfect untill this past year when we went camping. Fan worked ok, but no cold air coming out of ducts. Compressor seems to kick on, or at least a lower pictched tone is present when the thermostat is lowered.( sounds like it always did, just no cold air, thanks Tim


Check compressor run amps is correct with a ampere meter. If less, it's under gas leak. Keep your arm on discharge line (smaller pipeline). If no heat means no gas in the system. Find leak and arrest it. Vacuum and recharge gas.Better service the unit and check. Due to condenser & cooling coil, air filter, blower wheel are dust blocked will result to very less or no cooling. Helpful?

Jan 31, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

Relay (?) sticking Dometic RV rooftop AC


Go up on the roof of the unit and remove the AC Shroud. With the unit running, see if you can pinpoint where the sound is coming from. The only thing on the entire AC that would make that much of a vibration would be the fan motor. Not sure what would cause the fan motor to do this. The compressor may do that but only if the windings are bad and then it would not be cooling.

Jun 30, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

keeps tripping breaker when running ac


you need to check that the breaker it rated high enough for the ac unit

Jun 04, 2009 | Dometic Rooftop RV Air Conditioner

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