– 81 –
4. Grasp the mullion and pull it vertically upward
to release it from the top and bottom retainers.
Circuit Boards
Main Control Board
The main control board operates some or all of
the following outputs, depending on the model
identifi cation used:
• Freezer temperature control using compressor,
fans and 3-way valve
• Fresh Food temperature control using
compressor, fans, 3-way valve, and damper
(single evaporator models)
• Ice Box temperature control
• Deli pan control using the damper, fan and
heater
• Variable fan speed control with RPM feedback
for the condenser, fresh food and freezer
evaporator, ice box and deli pan fans
• Freezer and fresh food evaporator defrost
control
• Icemaker control for models with an icemaker in
the freezer
• Control of freezer icemaker water valve.
• Control of case water dispenser on non-
dispenser models
• Control of the isolation water valve
• Control of mullion and ice port heaters based on
external temperature and relative humidity
• Control of the fi ll tube heater for the icemaker
located in the freezer
• Control of the interior LED lighting in the fresh
food compartment
The main control board is installed in a recess
located in the back of the refrigerator. The recess
is concealed by a cover that is attached with two
1/4-in. hex head screws at the bottom and 2 tabs at
the top.
(Continued next page)
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