Thor Forums

[javelin]

No mention of year of coach, or furnace manufacturer which can help. Did this problem start after or during a heavy rain? Were any changes/repairs being made in the coach recently around the thermostat or furnace?
I assume that you mean the furnace blower fan never stops running......or is the furnace continuing to heat also? Make sure the thermostat is not calling for heat and that the thermostat does not have a fan over ride control set to run/on. You could also try setting the thermostat to off or to cooling to see if that makes a difference.
Usually the furnace provides 12vdc to the thermostat and some thermostats also have a fuse inside which can be pulled to cut the 12vdc through the thermostat. If this does not stop the blower (there might be a time delay before it stops) then there may be a short cct somewhere or a bad control board as mentioned by previous posters. I have seen where the thermostat is actually calling for heat, but the coach has run out of propane.....and the fan continues to run.