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The genuine OEM Trane IGN00026 hot surface ignitor glows red-hot to light the gas burners at the start of each heating cycle. When it cracks or wears out, the furnace won't fire — you'll hear the gas valve open with no flame, or see repeated ignition-failure lockouts. This factory-matched ignitor delivers the correct resistance and glow temperature for dependable startups in your Trane furnace.