Question about Dometic Rooftop RV Air Conditioner

1 Answer

High cool not working

The low cool and low fan works but high cool and high fan does not work at all. I can here a humm on the roof if I try to turn it on.Whats uo

Posted by on

  • gitzit1 May 11, 2010

    Do you think it could be a fan capasitor? or is it even worth trying it.

  • Anonymous Mar 22, 2014

    modle#MGHOO55B THE FAN BOWS FOR ABOUT 20 MIN. THEN CUTS OFF AND THE UNITE DOSE NOT TRY TO COOL AND THE LINE DOES NOT FREEZE UP LIKE ITS OUT OF FREON

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 828 Answers

Compressors on these units runs at only one speed. The change to high cool is only a change in blower speed moving air faster over the cooling coil. I would have the running capacitor for the fan motor checked. A bad capacitor can cause your type of problem. The other problem could be that the high speed winding in the fan motor is bad. Try it operation in the fan only position through the two speeds. If it works in the low and high speed for fan only your problem could be in the selector switch.

Posted on Jun 28, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Ac works fine when fan is on low but fan cuts off after a couple of minutes on high


Bad fan motor. Multi-speed motors have a set of windings for each speed. Your high speed is bad so the only solution is to replace the complete motor. When motors are going bad they will over heat and kick out on the heat safety. As it cools back down it will start again for a short time again until it gets hot again.

Jul 12, 2015 | Coleman Dometic Duotherm Rv Air...

2 Answers

Front unit high cool and high fan not working


just replace the fan ..... its seems there is some voltage problem

Jun 25, 2008 | Dometic Rooftop RV Air Conditioner

1 Answer

I have a rooftop ac unit on my popup that was replaced two years ago. The unit works fine but I would like the fan to shut off when the compressor isn't running. Is there a switch for putting the fan...


Please describe your controls. Does it not have low fan, high fan, low cool, high cool on the dial at ceiling? If yes, low cool or high cool setting should shut it down when temperature is reached via thermostat dial.

Aug 29, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

Model #LG LWHD1500ER The fan to cool no longer runs on the low speed. It will just humm. On "energy saving mode" the unit does not always turn on to cool. On the "cool mode" when the fan is on high it...


www.appliancefactoryparts.com/content/.../118816.pdf - United States
Above is your service and repair manual, with this you will be able to troubleshoot and repair your Aircon.
I suspect, your thermostat may have a faulty sensor?
factoidz.com/troubleshooting-your-air-conditioning-thermostat/

http://www.inspectapedia.com/heat/Thermostats.htm

Below is a DIY AC, troubleshooting how to. http://www.repairclinic.com/Air-Conditioner-Troubleshooting

Jun 26, 2010 | LG LWHD1500ER Wall/Window Air Conditioner

2 Answers

Fan will not run on high. Compressor runs fine but the fan will not run on high. Works fine on low and med.


It's the mode switch contactors for the high setting just overview the wiring of the high cool or high fan contactors if it's not there check all leads for the high fan or high cool circuitry.

Aug 01, 2009 | Coleman Mach III Air Conditioner

1 Answer

No high speed on blower motor


if motor works on heat, but not on cool ,then the low speed is energized by the heat strip or control board .if the motor doesn't run in high on cool, then the fan relay or black high speed tap from the board is not being energized. usually its the fan relay ,which is only a factor in cool in high speed fan mode. try turning fan to on at stat. that energizes fan relay and blower should run in high. gently tap the side of the fan relay and see if fan comes on all of a sudden. if it does the relay is bad. change it wire for wire label all wires and use exact replacement relay unless you know how to read wiring diagram then you can use a 90-340 generic fits all replacement. trace motor power wires back to relay or control board to find where they are fed from.

Dec 07, 2008 | Carrier Air Conditioners

1 Answer

Fan Seems To Be the Only Thing Working


no you problably have a bad thermostat on the unit

May 27, 2008 | GE AJCQ08ACB Air Conditioner

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

Related Topics:

537 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...