Industrial-Grade Durability: Engineered to resist fatigue in high-demand HVACR environments

Tank Integrity: Prevents internal vacuum build-up to protect against tank siphoning and structural implosion

Technicians should verify that the 2

and air handling units that require efficient mixing or diverting

Nordyne 917178A Control Board Els PW 17895 Industrial-Grade Durability: Engineered to resistThe Nordyne 917178A Defrost Control Board is the official OEM replacement module designed to restore the automated defrost logic in residential split system heat pumps. This unit is a direct fit successor to the obsolete Nordyne 621579 and various older 1084 series boards, ensuring a seamless interface with existing 24V control circuits and sensor leads. As a veteran grade heat pump defrost control, it utilizes precise temperature monitoring at the