Dometic Duo-Therm Low Profile AC

darbyjudy · 01-03-2012, 08:06 PM

I have a 2004 Gulfstream Sunvoyager with two Duo-Therm Roof Top AC units. We noticed the AC compressor was running on the front unit, even though everything was turned off. First I removed the cooling wire from the thermostat and it still continued to run. Only way I could stop it was to trip the breaker. I went on top the unit and took the cover off the AC and found a relay board. I have removed the board and ordered a new one. After taking this board out I find that now the furnace will not work.?? Does this board provide voltage also for the furnace? I was trying to find a diagram that shows how to wire this relay board, but all I can find in one with dip switches. This board has no dip switches. Thank god I did make a diagram so I don't mess the wireing up. Has any of the rest of you had this problem. And I am hoping the relay board will be the fix. And as you might now it is now the coldest night of the year. Suppose to get down to 22 hers tonight and no furnace. I am running two electric heaters but it is still cold in the unit. The relay board # is 3106996.030

**RV Wizard** · 01-04-2012, 02:54 AM

The control board does control the furnace from the T'stat. Depending on the make of furnace you have, there are a couple ways the furnace can be controlled via a thermostat. Hopefully the control board has a bad compressor relay causing the unit to run when off and a new control board should resolve the problem. There are some pdf files iRV2 Forums - Files - Heating and Cooling that may help. Let us know if you have a Suburban furnace and we can get a file put up or sent to you. Good luck and keep us posted.

ronspradley · 01-05-2012, 09:12 PM

If your furnace heats the holding tanks and wet bay, you might put a light bulb in there to keep from freezing until you can get furnace working again. Good luck.

ronspradley