I’m hoping someone can help with my furnace problem.
The furnace has begun to cycle off on what I assume is high limit and will only run again when the t’stat is manually cycled to “off” then back to “heat.”
I have determined that when the door to the furnace is removed and allowed to blow directly into the cabin Vs the ducts, it runs as designed.
Cleaned the burner and inside of the heat exchanger
Replaced the high limit switch
Cleaned the fan
Confirmed no obstruction in the intake or exhaust vent(s)
All ducts are clear and unobstructed
Air flow seems to be the same as it’s always been
Replaced the propane regulator
With the furnace door on and air forced through the ducts, I get a discharge temp at the floor register of ~ 175°. Not sure if this is normal or too high. I do see where the vinyl flooring at the furnace door has been heated to the point of discoloration and has curled up.
Would a low voltage cause a problem such as reduced CFM or overcurrent? Seems to be normal air flow and the voltage is ~12VDC while the fan is running. (Shore power)
Can’t seem to find anyone with enough knowledge of these symptoms. They are parts changers. It would seem to me that if the unit works, it can be made to work properly without changing out the entire unit.
I would really appreciate any suggestions