bobmason
Jan 5, 2009, 07:58 PM
I have a very old rheem (15 + years) gas furnance/AC in the attic. Lately, my home has been very cold, the first time in the 10 years I've been here. I don't know much about hvac but here is what my unit is doing. First, it is cycling on and off nearly constantly. It will go through one heat cycle and after maybe 5 minutes start again. When I turn the thermostat on, the burner comes on and heats for about 3-4 minutes and then turns off. The blower comes on after this. The air is warm but not like it used to be and the blower continues until the air is cold. Then the blower goes off, the burner comes back on and the cycle repeats constantly. The unit has no electronic parts, it uses a pilot light and a fan limit switch. The limit switch is set to off at 90, on at 130. Is the limt switch bad, do I need a new thermostat?
Any information would be helpful. Unknown model number
Thanks
Any information would be helpful. Unknown model number
Thanks