Question about Desa International ALL-PRO® SPC-85 Utility Heater

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Misfiring Master Heater

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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  • 232 Answers

Check:

  1. water droplets in the fuel tank
  2. transformer not grounded good
  3. restricted fuel filter- causing starvation
  4. air pump pressure not correct

Posted on Nov 23, 2008

  • Dewey Newbury Jan 09, 2012

    I had the same trouble it was the high-tension (voltage) line was shorting to ground. Once I insulated the line, it stopped misfiring.

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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:
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  4. the nozzle is restricted or worn.
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  6. water in the fuel. When a droplet passes through there is a momentary flameout condition which will cause the photocell to shut the unit down.
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Dear travelinman4, 02-21-2009 18:24 EST (USA)

Re: Reddy Heater "Won't Stay Running"
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jack
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