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Section 3 - Service and Repair
ICE MAKER
WARNING
DO NOT cycle ice maker by hand. This will cause
damage to the ice maker.
Freeze cycle
• Neither ice maker relay is energized.
• Unit is cooling down to 15°F set-point.
• The unit may cycle on and off as the ice maker is pulling
down to maintain the proper refrigerator/freezer
temperatures.
• The minimum freeze time as permitted by the board is 20
minutes (CO2175F) or 75 minutes (CO2175DWR).
Harvest cycle 1
• Relay 6 is energized for 30 seconds and relay 7 is energized
for 10 minutes. The bin arm must be fully lowered and the
lower drawer closed for this cycle to begin.
Harvest cycle 2
• The lower drawer must remain closed for the cycle to
continue. In the event that it is opened the timers will hold
until the drawer is closed. At that time they will resume the
cycle. If the unit has a door rather than a drawer it is not
effected.
• Relay 6 is now off and the ice maker is powered completely
by relay 7. This occurs at approximately the 2 o'clock
position.
• Ejector blades stall on the ice until the heater releases it
from the mold.
• This cycle will last a few minutes.
Water fill cycle
• At about the 10 o'clock setting the water valve is energized
for about 7 seconds to refill the mold.
• At the conclusion of the cycle the blades stop at the 12
o'clock position.
Harvest cycle 3
• Following the water fill relay 7 remains energized for the
balance of the 10 minutes that it needs to remain on.
Storage mode
• The bin arm is in the UP position, either held in place by the
ice or manually raised. The board continues to signal the ice
maker to harvest so relays 6 and 7 will energize; however,
with the arm up the cycle will not begin.
Review the following notes for general information before
reading the schematics.
These are some additional general notes and exceptions:
• The unit is equipped with a four-minute compressor off
cycle.
• The controller is designed to be able to show and set the
refrigerator set-point. Based on this input the controller
tries to maintain the perfect balance of refrigeration to keep
the refrigerator and freezer at acceptable temperatures. For
this reason the refrigerator temperature may fluctuate from
34°F to 40°F depending on the freezer load. The freezer will
also float in a -10 to +10 range depending on the
refrigerator load and usage.
• The ice harvest will be initiated when the ice maker
temperature drops to 15°F. Through a built-in timer the ice
maker can only harvest once every 20 minutes (for
CO2175F) or 75 minutes (CO2175DWR) at a maximum so
if the temperature is at 15°F it will not necessarily cycle
depending on when the previous cycle had occurred.
• The drain pan heater will energize five minutes before and
after the hot gas portion of the defrost cycle (not on
CO2175DWR). This time is not included in the defrost total
length.
• If the unit is turned off while the ice maker is in a harvest
mode, the display will flash OFF while the ice is harvesting
— up to 10 minutes.