i have a Coleman Furnace, Last night i lit the pilot, it took a while for the funace to kick on even with the thermostat kicked way up. It finally kicked in, ran for 30 seconds or so, and shut off. it did this continuously for a while. I cleaned out the A coil, filters are clean, thermostat is working. you can tell when it hits the temp on the thermostat, the burner ignites, but it wont kick on the blower. I turned the furnace to continuous, and the blower comes on, so i know it works. I think there is something preventing communication telling the blower that the burner is ready and to flip on the fan
Found no date on the furnace. The mobile home is a 1990, so it may be original.
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