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replacing the defrost control board usually restores normal operation
Featuring a 3/4-inch NPT connection and a 7
What is the difference between an isolated coil and a grounded coil
Cost-Effective Maintenance: Restores full functionality to the solenoid valve without the need for piping rework or purchasing an entirely new valve body
What are the connection sizes for this 10-ton compressor
Lennox 21J99 Control Board 328140-751 replacing the defrost control boardThe 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 Designed specifically for Lennox branded equipment, it replaces outdated ignition modules that cause common
US$ 46.00
US$ 7750.00
US$ 725.00