Furnace starts out great & then later not?
Two trips in a row now are furnace starts out great! Lots of heat & by morning when we wake it blowing cold. Can anyone help me fix this? Suppose to another cold night.
Forum Discussion
When you ran the furnace later and it worked had you driven the rig and charged up the batteries some? The sail switch is in the path of the air flow. When the battery is fully charged it has enough to operate the fan and create good air flow so the sail switch is activated to turn on the gas flow to the burner. As the batteries run down they do not put out enough air flow to cause the sail switch to activate. This well not allow the gas valve to open and let the propane flow. The sail switch has a flap over it and the air flow causes the flap to push down on the sail switch. This tells the gas valve that there is adequate air flow for the furnace to run. I have had this happen to me when the batteries start to run down.
