This OEM Trane temperature sensor utilizes a 20K ohm NTC thermistor to provide high-accuracy feedback to the system controller

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a full Lennox flame sensor replacement is the professional standard

This furnace secondary coil is designed to handle corrosive condensate while maintaining optimal thermal transfer

ASCO AH4E112S4 Actuator 321894-709 This OEM Trane temperature sensorThe ASCO AH4E112S4 Actuator is a high performance electro hydraulic linear actuator designed for demanding industrial and commercial burner applications. This Hydramotor actuator operates on 120Vac and features a sophisticated Low High Off control sequence, allowing for precise gas flow regulation. Engineered for efficiency, it boasts a fast opening time of 14 seconds maximum, ensuring rapid system response, while providing a critical safety shutoff