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Bryant 90 plus furnace wont fire.
Their is a Bryant 90plus furnace that is aggravating me to death. It will not fire and I cannot seem to pin point the problem. The furnace is about 14 years old.
The control was giving me an error code of 31 - pressure switch, rollout, high limit, Failure. I checked the pressure switch found that it would not make and replaced it with a universal P.S. that I got from my Bryant retailer. Replaced pressure switch did nothing. Furnace still would not fire. I was curious so started doing some work.
Checked vents- open, checked the P.S tubes running to the combustion chamber, inducer, and gas valve for cracks or damage they were fine. Inducer starts up with no problem
Condensate clean of debris, Cleaned the burner manifold etc
I jumped out the P.S and very quickly after the HSI began to glow and then the pilot lit rolled out shutting itself down again. I then restarted the furnace and jumped out both the limit switch and the rollout switch as well and the furnace did the same thing lit quickly with a bang and turned off. Now I think it could be one of two things here a bad exchanger or a bad inducer motor as the pressure switch is not making. I am not concerned with the gas rollout as I think the homeowner played with the gas pressure and I am going to re- adjust when I go back over their.
So now my question is How to I check for a cracked exchanger or a bad Inducer motor. I have 120 volts to the inducer and the bearings are not stuck but my lack of experience with gas really is shooting me in the foot here....
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