Comfort furnace


Old 12-27-16, 12:33 PM
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Comfort furnace

My furnace starts up then pilot light ignites but main burners do not come on,does anyone know what would cause this.
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Old 12-27-16, 12:47 PM
Join Date: Oct 2016
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Perhaps more info would help us help you more. Make, model and serial, control type, any troubleshooting you've done so far.
Does the pilot stay lit? What's the MA signal from the flame sensor?
Old 12-27-16, 01:03 PM
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Model C9MPT050F12A3 serial LO244 36901 control type is Honeywell stays on for awhile but goes out after but sometimes the burners will light up think MA is 9.5
Old 12-27-16, 01:38 PM
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Possible a dirty flame sensor rod or poor pilot flame. The pilot flame should engulf 1/2 to 3/4 inch of the flame sensor rod. If it does, the flame sensor may need cleaning. Clean it carefully with steel wool or other very fine abrasive. Be careful not to damage the hot surface igniter, which is between the pilot and the flame sensor.

If the pilot flame doesn't engulf the flame sensor sufficiently, the pilot burner or orifice may need to be cleaned.

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