flame

Looking for advice. My Goodman GDT090-4B furnace is not operating consistently. Sometimes it will not light and display a single flash error code. Sometimes it will light and run for a minute or two then the flame turns off and it will display a single flash error code. According to the manual...

Hi folks, I would really love any help if you all can identify what's happening in my boiler. This video shows it all, with sound to help debug: https://www.youtube.com/watch?edit=vd&v=fY7rAYZu05g The boiler is on natural gas, I recently cleaned out the chamber, replaced the rear refractory...