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Gas Furnace Spark Ignition Troubleshooting- Mercury Flame Sensor!

In This HVAC Troubleshooting Video, I go over the Diagnosis of a Gas Furnace Spark Ignition System used on older furnaces, boilers, and water heaters. This covers the Mercury Flame Sensor and the Spark Relight assembly. I show you how these are wired, how they work, and the testing with a multimeter for troubleshooting!

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