Lennox 23X17 Control Board 321894-708 While this is a direct

While this is a direct OEM furnace control

Technical specs confirm its construction uses high-dielectric insulation to prevent voltage leakage and "ghost" signals that trip sensitive flame sensors

this is a direct-acting valve

Once the temperature drops to the 250-degree Fahrenheit closing point

Lennox 23X17 Control Board 321894-708 While this is a directThe Lennox 23X17 Control Board, also identified as the Lennox 620244 02, is an essential demand defrost control designed for high performance heat pump systems. Built to replace previous iterations such as the LEN620244 02, this board integrates multiple critical functions into a single 24V module, including demand defrost logic, a defrost relay, and an anti short cycle timed off control. It features a sophisticated pressure switch system lockout