Dometic Rooftop RV Air Conditioner
Problem for Dometic Rooftop RV Air Conditioner

Crazy Heat




By crazyseagull on Sep 22, 2009

" "
I have a Dometic Duo-Therm Ducted air conditioner with a analog stat. Some times in order to make the heat work I have to: set the stat to cool and set it to the lowest temp setting. Then I set the stat to heat and a desired temp.The heat works fine as long as I leave it on heat. If I just set the stat to heat it does not do anything. This is a nine year old unit. This does not happen all the time. It seem it is getting worse. It happens more often now. Dometic said to replace the stat and control board. That is an expensive fix. Any one out there have a similar problem ? The control box has a Model number 3107541.09 on a label if that is any help.If I disconect the heater wires and short them the heater starts up. I could separate those wires and install a new stat only for the furnace. The Air works fine.
Comments:

Sep 22, 2009

- I have the repair manual for the stat. It has a chart for the correct reading in all the modes. That will rule out the stat. Looks like the board is bad.

Sep 23, 2009

- I have the repair manual for the stat. It has a chart for the correct reading in all the modes. That will rule out the stat. Looks like the board is bad.

Oct 30, 2009

- Dometic sent me the troubleshooting manual for this unit. After removing the cover and checking the wires for proper voltage I found if i wiggled the switches I got the unit to work. The solution is the thermostat is faulty.

Best Solution

posted on Sep 22, 2009
Helpful)

drberry

Rank: Guru 
Rating: 92%, 82 votes
I think that I would change out the thermostat only due to the symptoms you are describing. Think the control board may be fine however, the thermostat sounds as if the internal componants are going out. Good luck on your repairs

Dave
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Asker's Testimonial
" Spoke to Dometic today. They think it is the board. A kit is $75. I am thiking about installing a house digital setback clock stat that uses batteries " - crazyseagull

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