Featuring a 5/16" bore size

providing robust switching for refrigeration compressors

always ensure the supply air is clean

When replacing an existing McDonnell & Miller probe

the gas valve is immediately de-energized to prevent hazardous raw gas accumulation

Carrier CESO110063-02 Timer/Defrost Board 30067439-890 Featuring a 5/16" bore sizeThe Carrier CESO110063 02 Timer Defrost Board is a critical electronic component designed to manage the defrost cycle for heat pump outdoor units. As a direct OEM replacement board for field proven legacy parts like the 1050 83 7B and CESO110063 01, this module ensures the reversing valve and outdoor fan motor operations remain synchronized to prevent frost accumulation on the evaporator coils. Engineered for Carrier, Bryant, and Payne heat pumps,