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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.
the air pressure is not set correctly.take a look at the back plate very closly and check to see if you have a crack in one of the plug bosses.if you do the back plate is no good and needs to be replaced.you should also change the adjuster,spring and ball at the same time.now you need to have a gauge to check to see if air pressure is correct.you can not set it with out one.
If the heater runs fine for the 15 or so minutes without smoke/odor- do this
check for water droplets on bottom of tank
check for restricted fuel filter
test safety control (reset)
You don't state whether this is a spark plug heater *or* Hot Surface Ignitor type. I made the assumption you were inquirung about a Spark Plug Heater. Disregard the list if the heater is an HSI type---- troubleshooting is different.