Suburban SW6P Water Heater Intermittent Flame Out on Start

Simple manometer........




But first...

Pull burner tube and clean it out with a bottle brush
Clean out the combustion/exhaust chamber.....run a wire thru then attach rag and pull rag back out
Remove main orifice and clean with alcohol
Clean thermocouple with some emery cloth
Clean/tighten grounds

Doing the above will go a long way to 'fixing' poor flame conditions.

Things as small as spider webs will disrupt a good flame