Hi all! I havea couple questions. I have a Janitrol gas space heater hanging from the ceiling in my garage, the problem I’m having is the burner comes on ok, heats up the unit then the fan kicks in for several seconds then kicks off then immediately kicks back on for several seconds then kicks off then immediately comes back on over and over again. Any idea what is wrong? Also any idea where I could get an owners manual for this space heater. Thanks