Furnace Issues
I've got a 2006 Cougar 24' fifth wheel. Not sure of furnace model, but it does have a Dometic thermostat for both heating and cooling. There are three wires to the thermostat labeled 12V, COMS, and GND.
My problem is, the furnace comes on and heats the place fairly nicely, then it shuts down. It never comes back on. This morning, with the trailer not used for a month, inside and outside temperature was 39 degrees. I turned on the furnace, set to 78 degrees. The inside temp came up to about 70 degrees and the furnace shut off. When the inside temp dropped to 64 degrees, I turned the thermostat up to 86 degrees. Furnace never came back on. I turned thermostat off, waited 30 seconds then turned back on. Furnace came on, warmed the trailer up to about 74 degrees, then shut off. Through the rest of the day, the furnace would warm it up, then shut off. I had to turn it off, wait a while, then turn it back on. The thermostat is a digital unit with one on/off button that steps through FAN, COOL, HEAT, and OFF. Plus there are up down buttons and a digital temperature display. I do know the thermostat must connect to a control board someplace to control the furnace and the rooftop air conditioner. I do not know where this control board is (furnace or A/C) and nothing is mentioned in any of the documentation that came with the trailer. I don't know if the issue is with the thermostat or with the control circuitry, wherever it is.
Any troubleshooting tips are appreciated.
Michael
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Michael & Sharon
WA7SKG & N8QBX
2006 24' Cougar 5th wheel
2005 F350 Long Bed Crew Cab
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