OEM Lennox DSI Furnace Control Board — 18P96

The Lennox 18P96 is a genuine OEM Direct Spark Ignition (DSI) control board that serves as the brain of your Lennox furnace. It manages the complete heating sequence — verifying safety limits, energizing the spark igniter, opening the gas valve, monitoring flame sensing, and controlling blower and inducer timing. Because it coordinates every safety-critical step, a properly functioning control board is essential for reliable, efficient, and safe furnace operation.

Common failure symptoms include a furnace that fails to ignite, short cycling, no response to a thermostat call for heat, a blower that runs continuously or not at all, an inducer motor that won't start, or diagnostic fault codes flashing on the board's LED. Corroded relays, cracked solder joints, and voltage surges are frequent causes of board failure, and intermittent no-heat calls often trace back to a degrading control board.

Why OEM matters: The 18P96 is engineered to the exact firmware, timing, and voltage specifications of your Lennox equipment. Generic or aftermarket boards can mismatch ignition timing and flame-sense thresholds, causing nuisance lockouts or unsafe operation. Installing the factory-specified board guarantees correct sequencing, preserves your equipment warranty, and restores the dependable performance your Lennox system was designed to deliver.