Lennox Furnace Fan Runs Nonstop Even after Heat Turns Off

[bender212]

Apologies if this has been brought up, but all the posts I found were the fan turned on and off randomly. My problem is my furnace fan won't ever shut off. The heat turns on, then stops heating when it hits the temp I entered on the thermostat, but the fan will ran forever until I turn off the whole unit.

I've reset the circuit breaker and also turned the on/off switch on the furnace, but no luck. I can't find the "reset" button I keep reading about, nor know where the fan limit switch is.

Any ideas would be greatly appreciated! I'm somewhat handy, but know nothing about furnaces. Thanks!

Lennox, Model# C26-31-1, Serial# 6095D29456

 

[Fitter30]

That model comes up the evaporator coil not the furnace. Should be a wiring diagram on the inside of blower door take a pic.

 

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[Mfellows]

Check your thermostat, is the fan set to "Auto" or "On", sounds like you want it to be "Auto"