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groundhogy's avatar
groundhogy
Explorer
Sep 24, 2018

Furnace Igniter.. what is that wire made of? Mine erodes.

So, my furnace igniter, basically 2-3 wires sticking out over the burner where the propane comes up, is no longer in production.

Last season, I took it to a welder, who proptly welded some welding rod to extend the lengths of the electrodes, and away I went. It worked great ... for that one season.

Yesterday, I turned on the furnace and it wouldnt light. Pulled the igniter and it had eroded very quickly.

So my question is...

What metal do they make igniter electrodes from?
What metal do they make spark plugs from? Im thinking the same?

Thanks,
groundhogy

28 Replies

  • Maybe, that igniter was designed to be compatible with several different control boards?
  • Yes, the electrode configuration seems odd electrically.
    There are three wires. Two on the outside which go to the Dinosaur board.
    Then one in the middle which goes to the case ground of the furnace.

    Only Two seem to erode. Im guessing the positive high votage, and the middle case ground. Thats where the spark happens I believe. The second wire from the Dinosaur board seems unaffected.
  • Suburban or Hydroflame? I bet dollars to donuts a replacement is available, easily if the board has been replaced in the past 15-20 years, which would mean you need a single electrode plus ground.
  • So would a normal welder have thin tungsten rods on hand?
    Just measured the diameter at 0.084 inches. Seems an odd diameter.
  • Tungsten is your best bet for replacement. It’s what is used for TIG electrodes. It doesn’t melt to 6000 degrees. Far far above temps in your heater.

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