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Featuring a 3/4-inch NPT connection and a 7
or rooftops
replacing the defrost control board usually restores normal operation
Experienced technicians recognize the importance of using Nordyne replacement parts to avoid compatibility issues during HVAC system diagnostics
When you're dealing with high-capacity fluid or gas control
Lennox 21J99 Control Board 328140-751 Featuring a 3/4-inch NPT connectionThe Lennox 21J99 is a genuine OEM replacement for aging or failed Direct Spark Ignition (DSI) control boards in residential furnace applications. Labeled under catalog number 21J99 and part number 105802 02, this module manages the trial for ignition period and flame sensing and operation of the inducer motor to ensure stable combustion cycles. Designed specifically for Lennox branded equipment, it replaces outdated ignition modules that cause common