Question about Dometic Rooftop RV Air Conditioner

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My motorhome roof does not support my 2nd air conditioner ( I an removing my ceiling fan and fixing new A/C

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  • Dometic Master
  • 6,674 Answers

And question is?

Posted on Jan 27, 2013

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

22yooper
  • 828 Answers

SOURCE: rv air conditioner

Check the temperature control and see if it clicks when you turn it off and then back on. Check to see if the compressor is running. If the compressor is running but not cooling you may have a leak and lost the refrigerant charge.

Posted on Jun 28, 2008

22yooper
  • 828 Answers

SOURCE: RV AIR CONDITIONER

Check the end of the fan motor for oil holes. They may have colored plastic plugs in them or aluminum plugs. If your motor has plugs on each end of the motor you can oil the bearings with SAE20 non detergent oil. Add 7-10 good sized drops of oil to each end. It takes time for the oil to work through the wicking to the bearings.

Posted on Jul 12, 2008

co7196
  • 3433 Answers

SOURCE: Roof Top air conditioner makes too much noise

Hello; Those roof tops can be noisy. Are you able to determine what is causing it? The fan? The A/C pump? Over tume, the vibration isolators that are rubber cushions the pump is mounted on, get weathered and hard and they no longer absorb the vibrations of the running pump. Those are easily chked and changed. The next point of excessive noise is the unit as a whole is tranmitting the combination of all the vibrating parts including its own housing. Here too we have a remedy. The roof unit has a seal between it and the camper roof around the hole it is fitted in. The seal is foam rubber and reasonably thick enougth to serve a purpose more than to seal out water and air. After and over time this seal ends up crushed from the weight of the a/c unit. Then the A/c unit comes in contact and is actually resting on yhe roof with what is now a very flat hard gaske. The roof unit is now vibrating the roof. This is as destructive as it is annoying. Ok? Now let's get rid of 80-90% of the noise. Check and replace compressor vibration isolator mounts. There are 4 bolts holding down the A/C unit. Sccess them from the inside by removing the ceiling trim and cover.There should be one on each corner. Bolts removed, one person push up on the unit and another on top lifting the unit. There are wires going to the unit and those may need to be disconnected. Clean the roof and the a/c where yhe seal goes.You can get a new seal from camping world or rv supply. Have your measurements, Unit make and model when you go.Assembly is just backtracking. On assembly, thinhs to pay attention to are:
Put the new seal on the A/C unit, not on the roof. It takes two people to ligft and set the unit back into the hole and center it in the hole. Don't slide it on the seal. lift it if it hs to be moved or the seal may roll over..
The wiring disconnected earlier must be dealt with and put in place for reconnecting.
Now start the bolts that hold the unit down.
Make sure-- Unit is centered
Wires can be reconnected
The four hold down bolts have their washers.
Someone go topside and verify the seal is properly in place. Measureing the for corners fo even height is one way to ck and looking under the unit is another. Now tighten the four bolts evenly. corner to cross corner. measuring again will help confirn its pulled down evenly. Pull it down no more than 1/4 to 5/16 of the seal thickness. Wire it up and put the trim and plastics back on and light it off. (run it and ck for noise and vibration. NOTE!!! The A/C unit cannot touch any solid part of the roof. Reason it was centered. Always ck the unit before each trip as you would any other psrts on the exterior of the camper. Good Luck Angie.

Posted on Sep 16, 2009

  • 18 Answers

SOURCE: fan not blowing in coleman trs rv roof air

well check a few things first....have someone remove the cover and reach in with a hand and try to manually spin the blade...free spinning?....then tell the person below to click in the on postion while someone views from up top.....is it humming? or even trying to spin?....if not check the fuse on the RV that protects the A/C unit.....good?.....now replace the capacitor ( it the silver or gray can looking thing that the motor wires run to) only the correct size will work w/o causing further motor damage.

Posted on Jul 08, 2010

heatman101
  • 43501 Answers

SOURCE: Coleman RV Rooftop Air Conditioner - cage fan

Hi,
Those squirrel cage fans have a habit of coming apart, or getting dirt in them and going out of balance...then they wobble and hit the sides of the fan housing...
Make sure the fan is clean and also move it around a bit to make sure it is not coming apart....
Often the only way to fix them is too replace the sqirrel cage part...

heatman101

Posted on Mar 06, 2011

Testimonial: "We did check the squirrel cage. It isn't coming apart, and there is nothing in there. It appears to be going around smoothly and not hitting anythin"

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Have A Duo-Therm air conditioner on top of my motorhome and it stoped cooling, the fan works fine. Is there a fuse in the box under the filter? It says there is on the out side. I am not sure where it...


Can you please reply with model number off bottom of upper (roof) unit. Should be able to see it when filter is removed from ceiling assy. Please include model of thermostat if possible. You say fan works, but when turned to cool, no compressor kicking in? Try shutting unit off, and turn off breaker at panel as well, give it a few minutes and retry and see if anything changes and let me know.

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Please give more details if possible. Roof air, with mechanical controls at ceiling, or thermostat on wall? Ducted system in ceiling or blows right out of ceiling assembly? Can you get a model number off base of upper (roof) unit, it should be visible when you remove filter from ceiling?

Jul 22, 2011 | Dometic Rooftop RV Air Conditioner

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I moved into a place that has a MasterCool Evaporative Cooler on the roof. The ownstairs is quite comfortable so I really only need to cool the 2nd story.... it seems as if all the cold air settles...


jbrown - Hot air rises, Cold air falls. If you have ceiling fans upstairs, turn them on to run counterclockwise at highest speed you can stand. Make sure all the windows are closed upstairs. The ceiling fans will help to keep the cool air upstairs and pull some from downstairs.

If you don't have ceiling fans, invest in a box type fan that you can place at the head of the stairs (that's the top of the stairs) run it on HIGH and it will act like an exhaust fan, by pulling cool air upstairs. It may take a while, but it will help cool the upstairs to some degree.

Hope this helped you. Please let me know. Thanks.

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1 Answer

My fan shakes and wobbles even on low and it also seems to by loose where it mounts to the ceiling. What do I need to do.


I imagine you have a ceiling fan hanging from the roof?? These fans are mounted on a hook which is loose from the roof. This is to prevent any vibration being transfered to the ceiling itself. Generally, there is a domed cover to hide the hook and associated wiring to the fan at the point of attachment to the ceiling. This dome should have a gap of a couple of millimeters away from the roof. If the fan is vibrating, it can also occur because one of the blades may be loose or dislodged. Try tightening up any screws holding the blades to the motor body or refitting the blades. If this doesnt help, you may need to remove all the blased and weight them seperately. 1 may have "thrown" a balance weight and is now unbalanced. Much like an unbalanced car wheel vibrates. All the blades should weigh the same. I used to fix these by supergluing metal washers to the top side of the lightest blades to make it up the weight of the heaviest. It works but someone may have a better idea...

Jun 15, 2011 | Heating & Cooling

1 Answer

How do you fix seal leak on dometic rooftop air conditioner ?


remove filter etc. from ceiling assy, you'll see 4 bolts that you remove,(basically 4 corners of lower tray at ceiling) unplug wiring harness and connector, that goes to upper unit from lower, then lift upper unit up off roof. position upper unit to allow for removal of 14" gasket. Install new gasket, set upper unit back over hole align properly, and re-install 4 bolts. Snug evenly until gasket is approx. half thickness of original. Re-attach harness plug etc.

May 06, 2010 | Dometic Rooftop RV Air Conditioner

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On my 28 foot Itasca motorhome the air conditioner is leaking water through the gasket on the roof. I pulled the inside cover off and took out the four big boltd holding the roof top section, but I can't...


You need to find where the drain is. The water should flow to a drain and not into the unit. Once you get the condensation draining properly you can use a good quality silicone to seat around the unit. You might check at a RV parts place and find a product they recommend for RV roofs. Hope this helps.

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It should have a drain so that it runs down off the roof instead of into the motorhome. All a/c's have a drain somewhere and they all plug up occasionally. A/C techs always carry coat hangers.

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