Not enough airflow in combustion chamber?

Sph1nx1899

hey folks, I’m having an interesting problem that I can’t find advice for in the vastness of the web. I have a York affinity 9.t furnace and I feel like not enough air is getting to the combustion chamber. When I watch it go through its cycle as I call for heat, the inducer blower kicks on, the igniter lights up, and I hear the gas kick on, but only 2 of the 4 nozzles light, which shuts it off until it goes through the process again, eventually going into a lockout because of failed attempts. I made sure nothing was blocking the nozzles on the two that weren’t igniting but that didn’t seem to do anything. What is interesting is that when I open the door a little bit to allow air into the chamber all 4 ignite no problems. All flames are steady and blue. The issue is that when it shuts off, it can’t reignite because of the above issue. I can recreate the solution by allowing a little bit of air into the chamber and it lights just fine. The chamber does have a sticker on it saying that it must remain closed to create the sealed combustion chamber so I don’t think I can leave the door off or anything, it also looks like a pressure switch might be going to the chamber which would probably fault if I left the door off. Anyone have any thoughts as to what the issue might be? Is there something that forces air into the chamber for ignition? Thanks everyone!

JOutterbridge

A picture of the furnace and flue venting (pvc) would be helpful. It's possible you have a clog or restriction somewhere. The burner should be able to operate without the door being off the burner assembly. That's in place to prevent flame rollout issues. It's for safety, same as the switch you see in there.

Also can you check and see if your intake and exhaust pipes are glued? I know this varies from state to state....

EBEBRATT-Ed

Sounds like an obstruction in the air intake or exhaust. Mice, dead bird etc.