I continue to have problems with my Comfortmaker RPJ2 furnace and it getting worse. This is what it's doing. When the temperature on the thermostat is set below the room temperature, the exaust blower cycles on and off. It's been taking less time before between the cycles, it used to take a couple of hours after the the thermostat stoped calling for heat to start this cycle but reciently it happens just after the furnace shuts down. The thermostat is not calling for heat while the blower cycles. When the temperature on the thermostat is raise so it calls for heat the furnace works normally. Once the thermstat doesn't call for heat, the blower motor starts cycling, just enought to get the motor upto speed and then shuts off then restarts, ect. This continues until the thermostat calls for heat again. I have repaced the thermostat but nothing. One other things is, while it's cycling, if I turn off the thermostat, the cycling stops.
Any help out there??