Question about Heating & Cooling
How could it sense gas? What it probably means is it does not sense gas ignition. These new fangled furnaces rely on electronic ignition. The only probo is a built in safety system which verify s ignition has occurred. This is critical. The system must confirm their is flame from monitoring resistance in a flame sensing probe and that verifies Houston we have ignition!. Ok what I believe might be happening with your furnace is the sensor is contaminated with a buildup o it which won't readily allow enough noticeable change in resistance for the control to recognize if the gas is lit. We would not want raw gas going into the house would we? So I would remove the flame sensor and clean the residue off it and retry like in this video
Posted on Mar 24, 2011
Testimonial: "Great tip. Worked like a charm. Thank you so much!"
Shut the power off to the furnace, and try cleaning the flame sensor with a brillo pad or wire brush and then restart the furnace. The flame sensor looks like a probe..... it will have a wire running to it and have a white porcelain shaft with a steel rod in the center attached to the burner with the probe in the path of the flame. opposite the ignitor on the burner section. Normal operation is that the ignitor lites the flame and then the gas valve opens and if it doesn't prove flame by the flame sensor it will shut it self off and then retry again and if it fails to prove flame then it will go into lock out and flash a error code.... If you reset power to the furnace it will try and lite the furnace again....
As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician or HVAC tech to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,check to make sure the power is off...
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS
Posted on Mar 24, 2011
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Posted on Jan 02, 2017
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