tophersig
Jan 23, 2010, 03:21 PM
Hello.
I have a similar problem to this gentleman with a Carrier unit:
https://www.askmehelpdesk.com/heating-air-conditioning/another-bird-vent-ignition-proving-failure-309949.html
Same furnace model #.
My unit intermittently does not produce a flame. What I observe:
1. The inducer motor spins.
2. The pressure switch outputs 25V after the inducer motor gets up to speed
3. The glow/ignitor gets red hot.
4. The gas value clicks open after 25V is applied to it.
5. No flame at all. The unit then turns off the gas and glow plug de-energizes. It then reports an ignition proving failure.
This occurs about 40% during calls for heat. Sometimes it recovers with subsequent attemps, other times it results in a lockout.
Sometimes I've seen the flame just start to ignite, but it started so late that the flame detection timed out, and shutoff the gas valve.
Questions:
1. Since the glow plug got hot, does that mean my pressure switch is okay? Is there another reason the pressure switch may be at fault? Does the pressure switch just ensure that the inducer motor is running? Why is it also connected to the gas valve?
2. Local gas company checked the presssure from the outside and its good. Since I intermittently have this issue, I assume there is no blockage in my house gas piping. Is this reasonable to assume?
3. Gas valves -- local technician doubts this could be the problem, since "when they die, they totally die". Is this true? Could the gas valve be intermittently blocking enough gas from entering the burners?
I know there is a lawsuit for my unit concerning the secondary heat exchanger. Could the sec heat exchanger cause an issue like this?
I really do appreciate any time you could spend on this. Wife and kids are getting restless. :)
Thanks,
Chris
I have a similar problem to this gentleman with a Carrier unit:
https://www.askmehelpdesk.com/heating-air-conditioning/another-bird-vent-ignition-proving-failure-309949.html
Same furnace model #.
My unit intermittently does not produce a flame. What I observe:
1. The inducer motor spins.
2. The pressure switch outputs 25V after the inducer motor gets up to speed
3. The glow/ignitor gets red hot.
4. The gas value clicks open after 25V is applied to it.
5. No flame at all. The unit then turns off the gas and glow plug de-energizes. It then reports an ignition proving failure.
This occurs about 40% during calls for heat. Sometimes it recovers with subsequent attemps, other times it results in a lockout.
Sometimes I've seen the flame just start to ignite, but it started so late that the flame detection timed out, and shutoff the gas valve.
Questions:
1. Since the glow plug got hot, does that mean my pressure switch is okay? Is there another reason the pressure switch may be at fault? Does the pressure switch just ensure that the inducer motor is running? Why is it also connected to the gas valve?
2. Local gas company checked the presssure from the outside and its good. Since I intermittently have this issue, I assume there is no blockage in my house gas piping. Is this reasonable to assume?
3. Gas valves -- local technician doubts this could be the problem, since "when they die, they totally die". Is this true? Could the gas valve be intermittently blocking enough gas from entering the burners?
I know there is a lawsuit for my unit concerning the secondary heat exchanger. Could the sec heat exchanger cause an issue like this?
I really do appreciate any time you could spend on this. Wife and kids are getting restless. :)
Thanks,
Chris