Went through all the Atwood crap this winter. The newer Montana's have a water intrusion issue, you need to pull the cover off and look for water. While you have the cover off have someone turn the therostat off and on, there is a light that goes green then red if it is flashing order an new control card (on Amazon for $80 ) might as well order a sail switch too. These two pieces are easy to fix with a small cross point screw driver. The other part of the equation is the thermostat it is probably ok but keep it in mind. Our unit is 4 years old and the manual swithover lever with regulator was only moving part way over causing low gas pressure particularly when it got down into the 30's. Good luck.
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