Question about Dometic Rooftop RV Air Conditioner

1 Answer

Compressor doesnt come on in a dometic duotherm rooftop ac unit.Fan runs but no compressor

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

  • Expert
  • 127 Answers

If this is a wall thermostat controlled unit, then check to make sure that you have power coming from the yellow wire on the thermostat when it is placed in the Cool/Auto High mode. If you do not have power at the yellow wire, then you have a bad thermostat. If you do have power, then remove the control unit from the inside of the AC and see if you have power at the Y terminal there. If so, when you turn the thermostat to cool, can you hear a relay clicking in the box? If not, then you have a bad control box. If the relay is clicking, you need to check the power at the compressor relay on the board. It has a black wire to one side and a purple (or blue) wire on the outgoing side. Check to see if you have 120V on the blue wire when the tstat is set to High/Cool. If not, then you need to bypass the freeze switch to make sure that is not the problem. If you do, then you need to go upstairs and check the start capacitor for OK. It is located in the side compartment of the upper unit, it has a small black relay on the top called a PTCR. These often burn out and will cause the compressor not to work. If that is fine, then you go to the top of the compressor to the thermal overload switch. See if you have power at both sides, if so, then you have a bad compressor. If not, then the overload switch is open and not allowing power to the compressor.

Posted on Jul 04, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

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

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

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

I have a dometic penguin ac rooftop unit. Model no. 630215.421. Fan blows Compressor does not kick on. Fan blows just no cold air. If put on auto and go up or down in temperature On the thermostat The fan...


Bad run capacitor or bad compressor. If you hear an occasional click from the compressor try a new run cap and then a hard start kit. Otherwise it's more economical to purchase a new unit.

Sep 25, 2013 | Dometic Rooftop RV Air Conditioner

1 Answer

Stops running thermostat


thermostat or relay module issue.

May 19, 2013 | Dometic Rooftop RV Air Conditioner

1 Answer

I have my dometic Rooftop ac unit. The heatstrip/fan run perfectly but when I turn on the ac...the fan runs good but when the compressor kicks on it just hums.


The compressor coming on does make a slight "humming" sound which is normal. Is the unit cooling properly? Do you think it is louder than before?

May 09, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a duotherm rooftop ac. fan runs fine but when comppressor starts it runs for 5 or 10 seconds and shuts down


I'm not familiar with these units so this is very general. Your compressor could be shutting down due to low pressure. You would need to get the refrigerant charge checked. It might be due to an overload tripping, which would then reset itself. If you had a schematic or something to send me I could tell you more.

May 05, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Unit won't turn on


WHEN A COMPRESSOR FIRST STARTS TO RUN THERE IS AN INITIAL HIGH STARTING CURRENT(30 AMPS PLUS),BUT THIS SHOULD DROP BACK DOWN TO RUNNING CURRENT PRETTY QUICKLY.IF IT MAINTAINS THIS HIGH STARTING CURRENT FOR A WHILE THEN THIS GENERALLY INDICATES THE COMPRESSOR AT FAULT,BUT!!!!! ALSO CHECK TO SEE IF THE FAN IS NOT SEIZED. DISCONNECT THE FAN ELECTRICALLY THEN RUN THE UNIT. IF THE STARTING CURRENT MAINTAINS APPROX 6 AMPS THEN THE FAN IS AT FAULT!........HOPE THIS HELPS!!
REGARDS........BIGGGAZZ

Oct 15, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

DuoTherm compressor starts but will not continue to run


check condenser fan if running. it will make compressor comes on and off if broken

May 31, 2009 | Dometic Rooftop RV Air Conditioner

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

808 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dometic Heating & Cooling Experts

Bill Long

Level 3 Expert

587 Answers

Donni Steen

Level 3 Expert

659 Answers

mike cooper

Level 3 Expert

884 Answers

Are you a Dometic Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...