I have A Master heater B99 deluxe. after it run for a fe minutes it misfires. i have changed the plug.it only misfires for a second.I also have checked the fuel line and pump. it seems to be an ignition problem
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sounds like you have dirt in your fuel tank, as the heater runas it picks up the dirt in the filter plugging it up. When the heater shuts off, the dirt falls out of the filter. You start the heater back up and it does it all over again. Empty your tank and change the fuel filter. Should be fine then.
Here is a link to your owner's manual... http://18.104.22.168/manuals/123919-01A.PDF. Look on page 8 and 10. It could be several things. It could only be a dirty fuel filter or the pump pressure may just need adjustment. If you need a part you can contact Master Parts at 800-466-1446 or you can find them on-line at www.masterparts.net. I hope this helps!
generally if a heater with a spark plug will run for 10 minutes or longer then that’s an indication that the electronics are functioning properly, so for now, eliminate "any fuel delivery problems" before trouble shooting the electronics. The spark plug should spark for the duration of the run time. If the flame goes out the heater shuts down (just like its designed to do). Imagine the fumes & danger involved if the heater continued to pump raw fuel into a hot combustion chamber! Some possibilities:
the plastic end cover is cracked. When the room heats up the crack expands allowing the air pressure to fluctuate.