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Therostat in rv doesnt work right

The thermostate in our rv only turns on furnace if thermo dial is on high, if dial is turned down at all it shus off

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Suggest you replace it.  If the unit runs on 12volts, a battery powered unit is fine.  Just connect the wiring to the appropriate terminals.

Posted on Nov 15, 2008

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Installing a Dometic single zone LCD Thermostate in my rv. Getting a code E1. Everything seems in the right place. Is there something the instructions for got to mention? How do I get it to work?


Try this.
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Hold + and mode at same time for 3 seconds.
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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.

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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.

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