the 2/5 RPM speed is critical for the sequence of operation

and Klixon 60000EOM-158 controls

meaning it remains shut until the 24V coil is energized by the humidifier controller

The Lennox 18H01 Limit Switch is a high-precision OEM replacement part engineered for critical thermal protection in heating and air conditioning systems

a clogged secondary heat exchanger

Trane KIT2049 Gas Valve Kit 321894-708 the 2/5 RPM speed isThe Trane KIT2049 Gas Valve Kit is a critical OEM replacement component designed for high performance gas furnace and packaged unit applications. This HVAC gas valve assembly functions as a dual solenoid combination valve and regulator, ensuring precise manifold pressure control and redundant safety shut off. As a genuine Trane replacement part, it is engineered to maintain the factory correct airflow and fuel mixture, preventing the common ignition