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Turn off thermostat. Wait for no display on lcd.
Hold + and mode at same time for 3 seconds.
Lcd should display - -
Turn on as usual.
If that dosnt work you have a cabling issue between thermostat and main board. Possible bit rare component failure. If all is installed correctly.
Hello, looks like it is going off on it's high limit switch, a limit switch is there to protect the furnace from overheating. most cuases are either dirt or the blower motor not running up to speed, anything that cuts down on the airflow will cause the high limt switch to open.
You have to hit the rest botton on the furnace for the led to pick up the remote always you can go to your rv manu and it will help you out if not you can go to any rv lot and they will show you how to rest your systems
My Unit is only about 5 years old; but it's working great now. I spoke to a man at an RV service department, he suggest replacing the thermostate and Jay box, which is the box inside my roof unit, accessable when I remove the filter. When I replaced the thermostate nothing changed, but the Jay box did the trick. The Jay Box came with a new thermostate anyway, and cost around $80. Good Luck
Sounds like you have a bad fan limit. they will sometimes kick on in the summer when the temp gets high enough. now it sounds like it is not working at all. it is usually mounted with a metal square cover over it removing the cover would expose the dial this it what turns as the furnace heats up and kicks on the fan . turning it by hand will check to see if fan will kick on(turn a lttle clockwise)
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.