I have a York TG9S080B12MP11A. Last year, it would call for heat, try 3 times, and then blow cold air until I shut it down at the switch, constantly. The last 5 codes were usually "Ignition lockout due to retries", "Limit switch open" or "rolloutswitch open". It would alternate between these 3 codes, even when I reset the last 5 codes, these 3 would always come up in some order. Taking the door off helped a little, but not much. I replaced both rollout switches in March and that didn't fix it, and gave up until now, and I'll need it again soon. Now, I go to start it and only the first two burners light. Call for heat, fan turns on, ignitor turns orange, first two burners light up cleanly and the last 2 don't light at all. Is this thing possessed? I gave it the nozzles a few whacks where they attach to the gas line, I also tried to clean the wings out with a utility knife, but it's useless trying to do it in such a cramped space. I'm thinking since the flame isn't jumping to burners 3 and 4, I need to clean the "wings" in the burner tubes so the flame will jump to all 4 burners, but at this point I'm completely at a loss for all these problems last year and now THIS this year. One HVAC guy came out in March and said replace the rollout switches so I did, I don't like paying someone to do something I can easily do myself, that's just crazy. Do I really need to take this thing apart? Also, any ideas on what was happening last winter, once I get the 4 burner problem solved? What can I offer to the furnace gods as sacrifice? Propane tanks are full, and my propane water heater works fine.

I have an old holly vented wall heater model 25 WS-WD and a similar double wall heater also holly vented. Lights up and heat. Where is the thermostat? The knob has mark for low, medium and high but even if I keep it turned to the low it wont turn off, so I wonder if it has any thermostat or ...? [ATTACH]49099[/ATTACH] [ATTACH]49100[/ATTACH] If it doesn't, can I install one and which model and how? My son is a plumber.