Addendum to an older post on this subject. 2010 Coleman Cobalt PopUp. On-Off switch on top of analog thermostat to Atwood Hydroflame Furnace stuck "on" and would not budge, so furnace would come on during cold nights even if temp lever all the way to the left. Per helpful prior post on this topic I pulled the thermostat cover and loosened the screw holding the on/off switch, hit it with some silicone spray, and then slightly tightened screw (screw has to be a bit snug to ensure that it causes metal strip to make contact with connection under strip, play with it a bit to find right tightness that still allows switch to move). still a bit stiff but now works as intended. If furnace operation not desired, also suggest turning off power switch under furnace face plate.
