Hello,

I have an old Rheem gas furnace with pilot light. I was cold the other morning and the fan was on all night. I switched it from fan to auto and turned on the heat and that's the last time the fan would turn on. If I turn on the heat, the blower and heat work fine. If I turn on the air no fan, if I turn on the fan, no fan. Does the same blower work for both heat and air? Why won't my fan turn on for the air or fan only but turns on when I turn on the heat? Please help!!