Question about Dometic Rooftop RV Air Conditioner

1 Answer

AC/Heatpump units cycle numerous times blowing ambient air.

When starting the Dometic AC/Heatpump units (independently of each other) in either AC or Heatpump mode, the units cycle through the start sequence numerous times blowing only ambient air (it seems the compressor never kicks in) before finally providing either cold air (if using AC) or hot air (if using heatpump mode). During the run cycle (when left on for an extended period of time) the units go in and out of working properly. It doesn't matter if the front unit is run isolated or the rear unit is run isolated, both units, independently of each other, react the same way. The telephone type cables have all been checked and the control panel seems to be OK. Any suggestions?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Dometic Master
  • 4,636 Answers

If the compressor never kicks in, I would check the start capacitor, thermostat and the compressor windings. Most times the start capacitor is defective. Some window air conditioners the fan will run while the compressor stop through the thermostat switch. If the thermostat switch is bad every thing runs except the compressor. Let me know, Thanks, Sea Breeze

Posted on Feb 07, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Fan run compressor run but no cold air


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

www.irv2.com > ... > RV Systems & Appliances
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

www.rvforum.net > ... > RVing message boards > Trailers & Fifthwheels
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
4 posts
Jul 21, 2015
Dometic SL-135 A/C problem
7 posts
May 29, 2012
Dometic ac compressor runs but fan does not on auto
6 posts
Jun 5, 2011
AC blower runs full time w/ AC on
14 posts
Sep 2, 2009
More results from www.rvforum.net

Nov 18, 2015 | Dometic 705600009 A-284, SMX II Retrofit...

1 Answer

Why will my Dometic air conditioner only cool to 15 degrees below ambient temperature?


A few things can determine that , or cause it. First of all, where are you checking the ambient air temperature and what type of system do you have, is it ducted, blows out of ceiling assy? Has unit been properly cleaned lately? If ducted, have you checked for cool air leaking by to return air box?

Aug 15, 2014 | Dometic Rooftop RV Air Conditioner

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

My 19 ft airstream's Penguin duo-therm a/c unit just started blowing out HOT air!!!! Why is this occurring?


If you have a heatpump model a/c unit, and it is blowing air that is hotter than the ambient temperature inside the airstream, then it is likely that your reversing valve is stuck in the open or closed position. A heatpump is basically an air conditioner that will also run in reverse (via the reversing valve) in order to heat instead of cool. The valve can get stuck for a variety of reasons, including; faulty wiring caused by rodents chewing or vibrations, insulators (dirt) between switch surfaces, or it could be a mechanical problem within the valve its self; these valves break often.

Sep 12, 2013 | Dometic Air Conditioners

1 Answer

Unit cools great but when extremly hot weather occurs it eventually freezes up.


dirty filters in the indoor unit.As the ambient temperature rises the unit will work harder and longer,its fine when its just a normal day because the evaporator coil wont have time to ice up as the compressor will cycle off before the coil freezes totally,but during extreme ambient temperatures the coil will ice up as the compressor will continue running to reach set-point causing the coil to ice up

Jan 02, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

2005 s type jag a/c quit blowing cold air suddenly .just blows hot at any setting or on auto


hi,is this a heatpump or a ac unit only...if a heatpump ,there is a valve that switchs from heat tocool mode...go outside with unit running..put hand on big copper line,if it is hot your in heat mode..if cold your in cool mode....possible stuck change over valve if a heatpump...hope this helps...good luck...michael doctor airr appl.repair..843-384-8474...if need more assitance..call..its free...good luck

Mar 26, 2010 | Air Conditioners

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

Duo Therm AC not working


If unit was freezing up the air flow would normally stop, until the unit is turned off and allowed to thaw. I suspect evaporator blower may have a worn out belt, or compressor is shutting off due to control or internal overheat. What is the age of the unit?

Aug 06, 2008 | Dometic Rooftop RV Air Conditioner

3 Answers

ROOF AC UNIT ISSUES


Ice on the coil is caused by 3 things; 1, low freon charge. 2, inadequate air flow across the coil, this can be a filter or dirty coil (I think you addressed these) or the fan isn't blowing enough air over the coil. 3, the unit is running continuously. A heat pump has another cause, that is something defective in the defrost system, like the sensor, reversing valve, control board or relay. If the breaker is tripping its because the compressor is over amping. There can be an obstruction blocking the fan or something like #2. Or the compressor is going out. If the breaker doesn't trip on other settings, like cool, but trips on heat, then I would look at the airflow.

Mar 14, 2008 | Dometic Rooftop RV Air Conditioner

Not finding what you are looking for?
Dometic Rooftop RV Air Conditioner Logo

224 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dometic Air Conditioners Experts

Bill Long

Level 3 Expert

577 Answers

Tim Whalen

Level 3 Expert

3056 Answers

Dan Webster
Dan Webster

Level 3 Expert

8147 Answers

Are you a Dometic Air Conditioner Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...