KaosAD
Member
I have a Coleman-Mack thermostat and it's worked perfect all winter. In the last two nights I have woke up freezing to find the furnace not running and it was running fine before I went to sleep. The first night all I did was turn the heat switch off at the thermostat and back on. The furnace then fired back up and ran fine the rest of the night. So when I woke up in the morning I took some canned compressed air and blew out all the contacts. Then last night it did it again, so I just turned the heat switch at the thermostat off and back on and bingo, it fired up and ran fine the rest of the night. No breakers are tripping, no apparent power problems, any ideas what may be causing this?