At some point this summer my furnace has decided that it has something to prove. It is displaying this by not turning off...ever. It started randomly with apparently no changes being made at all. The thermostat was set to 60 F (it was about 75 F in the house at the time) and the furnace kicked on and would not stop until I turned the system to OFF at the thermostat. That worked for a while and then on a quite warm evening (about 80 in the house) the system turned on again and would not stop no matter what I did at the thermostat. I turned it on and turned the temp down as far as it would go, turned in back off, took of the control panel, put it back on and turned the system back to off. None of this made any difference at all. I did wait a few minutes to make sure the system had enough time to respond to my wishes. I ended up turning the gas off at the control valve just before the gas line goes into the furnace. The valve looks fairly new and I found an old one down there laying near the furnace. Also I pulled off the wires coming from the thermostat and the transformer to the control valve. I did this while the system was running and it turned off when I disconnected them and came back in immediately when I reconnected them.
My thermostat is a Braeburn Model 2000 and the furnace is very old. It says "Day and Night" on it and the model is 105 HFA L.
I have a call out to Braeburn to see if they can help with the issue.
Any input/advice would be appreciated.
Thanks from Whitefish Cory