This is a perfect example of what I didn't like in the auto repair shop except this is a furnace. Two people tried (not qualified) tried to fix it, gave up, now I inherited the mess.
Anyway, when you look through the site glass, the ignitor glows, hear a solenoid click about a min. later, gas comes on with a raspy looking flame for a few seconds then it seems to shut off on safety. She had a brand new flame rod and insisted I try it... Same result. Connection was cleaned too.
Almost seems like it's not getting enough gas, or too much air. Could just be coincidense, but the furnace condensate trap was dry rotted and leaking, so instead of replacing it with the right part (which was done today now), they went to some aquarium store and fabricated a part, like a T conn., 2 days ago.?. It was just laying in the bottom not mounted like the cond. trap is now.
I don't have the right eqt. to check the gas pressure, and my meter doesn't read microamps to test flame rod signal voltage.
It's a tenant so I'm sure she will call an hvac co. b4 I get a response, but any imput would be appreciated. We haven't got to gas furnaces yet in school, so I'm not much help here.