I have a gas Heil furnace model # NUGS125AK01. It won't light up. The ignitor lights and then goes out. Then it tries over and over and never lights. My buddy began banging randomly inside it and it fired up. I knew it wouldn't last and sure enough today it doesn't work again. I read one of your posts and you said to try the trick where you try to clear out any lint blockages where the rubber hoses connect. Nothing. A red light blinks constantly also but I cant find any diagnostics online for it. Any ideas? TY tim