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the LED will illuminate red to indicate an alarm state
ensuring that duct temperatures meet design specifications during the auxiliary heat cycle
with a fail-safe position timing of less than 60 seconds
This specific unit is optimized for natural gas with a
or atmospheric regulator
Lennox 21J99 Control Board 322838-752 the LED will illuminate redThe 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 Designed specifically for Lennox branded equipment, it replaces outdated ignition modules that cause common
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