I have a Lennox G12 series furnace that seems to be having an ignition problem. Periodically when the furnace ignites a flame forms at the oriface inside the burner. A little history is in order.
Initially I was having this problem with on specific burner. HVAC guys have been out three times. They have check the burners, orifices, pressures ect. and thoughly cleened the furnace three times. Still this specific burner continued to ignight at the oriface inside the burner about 20% of the time. Two days ago they were out and installed a new burner in this position. Now this burner is working fine but for two days two other burners that had never done this in the past are now doing it about 40% of the time. It is consistantly the last two burners now. The new burner is at the number one position from the gas valve position. The furnace was a new install in the house back when and is propane
I'm in no way a DIYer and have no intention of trying to fix this problem myself but when I called my HVAC guys yesterday to report the problem they seem perplexed and don't seem to know where to go next.