Quote:
Originally Posted by garycoleman
After the call for heat, The ignitor glows, burners ignite. After 1-5 minutes of running (without reaching the desired thermostat temperature) the burner shutoff, the blower keeps running, and cold air comes out of the ducts. Could this be a bad ignitor? Or something else? Thanks 
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Shut off the power to furnace, remove the flame sensor and use steel wool to clean the sensor. Power the furnace, call for heat...this should do it.