Ignitor Troubleshooting Guide

If the ignitor combustion air setting is not correct...

  • Check the combustion air pressure at the 1/8" tap between the ignitor and gate valve.

  • Close gate valve and check pressure at end of ignitor.

  • In most cases, ignitor air setting should be 2" to 4" wc above the pressure at the end of the igniter.

  • Pressure-fired units - the combustion/cooling air ignitor valve is utilized to balance system pressure for ignitors. The blower outlet damper is used to control ignitor pressure (approximately 2" to 6" wc above furnace pressure) relative to furnace pressure.

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