Whirlpool WRF954CIHV Service Manual page 21

Harvest
When the ice is ready, the IM will Harvest. Before Harvesting,
the IM checks that the Ice Bucket is in place (Ice Bucket Switch
Closed).
Ice Break
12.7 VDC is applied to the IM Motor, driving it Counter-
Clockwise (CCW) to the Ice Break position. In this position,
the Ice Tray is flexed, breaking the ice.
Ice Level Detection (Bucket Full)
At the Ice Break position, polarity is reversed, driving the Ice
Tray clockwise (CW). As the Ice Tray continues driving past
the home position, the Bail Arm lowers. If the Ice Bucket is
full, a switch will close in the gearbox, changing the resistance
of the resistance ladder. The polarity is again reversed to
the motor, returning the Ice Tray to the Home position. This
process will repeat every hour until the Ice Bucket is not full.
Ice Level Detection (Bucket Not Full)
As the Ice Tray drives CW past the home position, the Bail
Arm is lowered. If the Ice Bucket is not full, the Ice Tray will
continue driving to the End of Travel position.
End of Travel
The tray is flexed as it reaches End of Travel, releasing the ice
to fall into the Ice Bucket.
Homing
When the tray reaches End of Travel, voltage polarity to the
motor is again swapped. The Ice Tray drives CCW until it
senses the Home position and stops. The ice maker is now
ready for a new fill cycle to begin making more ice.
Jammed Timer
While the Ice Tray is travelling, a jammed timer is initiated. If the
Ice Tray does not return to the Home position within 90 seconds,
the IM transitions to a Jammed state, and will not make Ice. The
IM will attempt to Home once every hour.
For Service Technician Use Only
Freezer Ice Maker
Operation of the Freezer Ice Maker is nearly identical to the In-
Door Ice Maker, with a few exceptions.
Time and temperature conditions for the Freezer Ice Maker ice
to be ready are different from the Door Ice Maker. In Normal
and Max Ice Mode, a 100 minute freezer timer must be satisfied,
and the Ice Tray temperature must read 3°F (-16°C) before the
Ice is ready for Harvest. Opening of the Freezer Door during
freezing will pause and add time to the freeze timer. The Freezer
IM is mounted to the top of the FC liner and has a different
part number. There is no Ice Bucket Switch associated with the
Freezer IM.
Ice Dispenser
The refrigerator is capable of dispensing cubed or crushed ice
from the In-Door Dispenser.
Ice is requested through the Dispenser UI. To dispense ice, the
Ice Door is opened, and the Auger Motor turns in one direction
for cubed ice, and the other direction for crushed ice.
Ice Door Motor
The Ice Door Motor opens to allow ice to be dispensed. It closes
10 seconds after the Ice Paddle is released to prevent loss of cold
air.
The Ice Door motor operates on 12.7 VDC supplied from the
Dispenser UI, J5-1.
Ice Dispensing Auger Motor
The Ice Dispensing Auger Motor can operate bidirectionally. It
rotates one direction for cubed ice, and the other direction for
crushed ice.
The Auger Motor operates on 130 VDC supplied from the GF2
board, P3-7.
French-Door Bottom Mount Refrigerator
DIAGNOSTICS
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1-17