Monitor has been running fair for about a week, found plugged fuel line going into burner, cleared that. will turn on, pot gets hot but no flame and will flash and shut down. Pulled out igniter looks very clean, flame detector looks good. Cleaned fuel filters and have plenty of fuel up to fuel pot. Inside of burner looks fairly clean with a small amount of carbon. Makes a panting noise while trying to run. Vents are both clean ( in and out) has me stumped.