Troubleshooting a Direct-spark Furnace Ignition Unit


Direct-spark ignition units produce an electric spark. This spark directly ignites the main burner.

The operational sequence of direct-spark ignition:

  1. The thermostat calls for heat.
  2. The ignition module is energized and starts to produce a voltage spark.
  3. the redundant gas valve is also energized.
  4. The spark created by the module is carried by the electrode. There it ignites the gas to create a flame.
  5. All burners will begin operating. When the thermostat is satisfied, it will de-energize the ignition system.

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