SOURCE: blower runs and have ignition and fuel but fire
Most likely the flame sensor. The sensor has only one wire to it and is L shaped. Unplug the heater and take some steal wool and gently clean the the sensor.
SOURCE: I can't turn my cozy
by pass the thermostat by removing the square plate on back of unit and pull the 2 wires off of stat and twist together if unit comes on the stat is bad.
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