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ATWOOD MOBILE FURNACE RUNS WHEN IT WANTS/

I'VE CHANGED THE IGNITOR AND THE THERMOSTAT. OPERATES WITH A ROOF TOP DOMETIC MOBILE AC UNIT. WHEN THERMOSTAT IS TURNED ON TO THE FURNACE ALL I GET IS A CLICK FROM THE AC UNITS RELAY

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  • Anonymous Mar 12, 2014

    Dometic ac is overriding furnace

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Check your furnace for power. will be 4 wires. power ground and 2 thermostat wires. Check for power at the time delay relay, if you have power there check for power going in the fan motor, if power in motor wire, motor is bad. If no power in motor wire and power going to circuit board take the 2 thermostat wire apart and wrap the 2 together comimg from the thermostat. Fan will stat in about 30 seconds. If it does you need a control kit in the ac. But sounds to me like you have a furnace problem.

Posted on Mar 19, 2009

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2 Answers

Turning on heater the AC unit kicks on. When using AC it won't turn off, just runs and runs and runs. Would this be an issue with the thermostat?


find where the thermostat bulb is located
if it is the ceiling or unit , it requires the unit to fill to the roof with cold air before it turns off
as most rv units are not insulated , the unit seldom fills with cold air enough to turn it off
I would get an accredited ac shop to check it out

Oct 20, 2015 | Dometic Rooftop RV Air Conditioner

1 Answer

My Dometic roof top ac doesn't cool. Fan runs fine, no COOL air. With thermostat in off position. Checking the voltages I found 118v at the breaker. At the run relay, 118v going in and a coupl


Please reply with Model number of bottom of AC unit ( upper) . Can be seen from inside usually. Thermostat model, plus if controls are at the ceiling assy or at thermostat on wall.

Jan 17, 2013 | Dometic Rooftop RV Air Conditioner

1 Answer

Replacing the remote control for rv ac/furnace with standard thermostat


You are aware that the ceiling assy (control box) will most likely need to be replaced as well, to work in conjunction with new thermostat. If you contact dometic ( www.dometicusa) and give them your model number off bottom of roof unit and what thermostat you are trying to install, they will advise what is required.

Oct 17, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

I got a Dometic roof AC (2010) on my RV , the thermostat is givng me a E5 code, I changed 3 thermostats, opened the top and inside caps to check if there's any cut or burned wires and nothing that I...


E5 Open circuit or out of range Freeze Sensor. Air conditioner and dehumidification

operation will be locked out. Heat pump, furnace, heat strip and fan operation
can continue to operate but displays the last temperature set-point.

Sounds like your freeze sensor is defective and since it is still under warranty, you would void it if you replace it yourself.

Aug 26, 2011 | Dometic Rooftop RV Air Conditioner

2 Answers

I have a new Salem travel trailer with Dometic products. Everything appears to work fine, but when I run my furnace and it turns on, my fan blows from my AC unit. I have owned 2 other RV's but...


Yes it sure does sound like something may be wired wrong, Could you please reply with model number of your AC unit as well as thermostat model? To find your AC unit model number if you don't already have it, remove your ceiling air filter assembly, and it should be on the base of the roof unit, facing you.
The base of the roof (upper) unit will have a model and serial number, and if you see a control box where all the wiring attaches as well, get model number from that too if you will. Those numbers should make it easier to determine exactly where the problem is. Thanks.

May 28, 2011 | Dometic Rooftop RV Air Conditioner

1 Answer

Dometic ac with atwood 1h2c thermostat will not come back on


Just a guess, as I am not familiar with the solar assist, if the stat is wall mounted I would remove it and verify if there is wither standard batteries, or a "watch" style battery. hope this helps

Jul 27, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

I''ve been working on this thing for three weeks now. It is a Dometic Duo Therm model 57915.531 roof top ac on my rv. It will not run. This is what i have done so far: replaced the thermostat, there is...


check the compressor winding resistance from common to start
start to run
run to common
the two lowest should equil the highest
also check shorted to ground
check the capacitors the go bad a lot

May 16, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Furnace problem


The problem is most likely in the control module of the roof air unit. Dometic uses the thermostat to activate and deactivate a relay in the control board of the roof ac unit whiich is just visible when you remove your air intake screen. The two blue with white stripe wires are the furnace control wires.

The furnace turns on and off by the opening and closing of relay. Most likely, the furnace control relay is stuck in the on position. On the thermostate, remove the fur wire and see if the furnace quits afrer it cycles down...it does not quit right away. With the termostat out of the loop, if the furnace does not shut down, the problem is in the control box. They are not hard to replace but you must be careful with the live wiire from the 110 ciucuit breaker. If you are not comfortable with the repair, take it to a dealer. The part number is on the assembly box. They need to know if you have the heat srip option or whatever othert options our Roof AC has. If the furnace still runs with the blue/white wires disconnected, the furnace wires are shorted somewhere between the furnace and the AC control unit.

Aug 21, 2007 | Dometic Rooftop RV Air Conditioner

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