Gas and Oil Home Heating Furnaces - Furnace lights, fan comes on then cuts off too soon

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helpmom
10-22-06, 03:14 PM
Mom has a model 7670c856 coleman gas furnace, the burner will light, heats, fan comes on, runs about 30 seconds to a minute then shuts off. The burner continues to burn even after fan shuts off, but will go off after a while. The fan unit will not heat the house because the fan will not run long enough. Is this possibly caused by a limit switch, if so which one (high or low)? Please help as she is beginning to get cold.

Jay11J
10-22-06, 04:28 PM
What happens if you turn the fan switch (at t-stat or furnace itself) to "ON"?
helpmom
10-22-06, 05:00 PM
The fan will run continually. It was working fine when the a/c was on.

Jay11J
10-22-06, 05:15 PM
For now, just leave the fan "ON" for heat..


Sounds like the fan switch is not working like it should.

Part #7710-3281 fan swithc (open85 close105)
http://www.mobilehomerepair.com/ColemanGas.html