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I checked the vents with my endoscope and no obstructions. I turned off my propane and turned it back on. I turned on my two propane burners and they fired right up with a steady blue flame. I left them turned on and started up my generator. My wall panel said I had over 13 volts. I opened up the exterior panel and checked for obstructions and found nothing. I reset the furnace at the switch. I turned on the furnace and it started up as usual and after less than 2 minutes turned off. The control board started a buzzing noise and the red light started flashing on the control board. It continued flashing non stop until I turned the furnace off. It did not give me a code of a certain amount of flashes but continued flashing until I turned it off. I put the exterior panel back on and tried the furnace again with the same results. It is a Dometic DFMD 35141 model furnace. I am thinking it is the control board that has gone bad.
Paul
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