I have a Goodman gas pack outside that is 13 years old that has never had any problems. It has been tripping out the flame rollout switch about every few weeks. I have replaced the roll out switch and still have the problem. The unit (model: PG030075-1AB) has burners (3 parallel tubes with ribbon slots) and I have cleaned the tiny build up of rust on them and there are no cracks in the burners. I have watched the ignition, intermitant pilot comes on correctly and the unit fires up with a uniform blue flame on all 3 burners, I see a very, very short flame rollout that is instantly gone when the burners are uniformly lit. Does not appear to be the problem. After many times of observation I noticed that on a windy day, the flame on one burner was billowing below the ribbon slots, actually rolling around the burner tube and then the flame could rollout of the burner box. I tried to create this by blowing into the flue vent and sure enough, the flame on the 3rd burner would roll around the tube and be below the tube as well as above the tube and a flame rollout would occur. I could blow hard at this 3rd tube and get the flame to leap back to normal. I will call a furnace technician but would like to know what would cause this so the correct component is fixed. Any ideas?