© 2010 Viking Preferred Service
38
WARNING
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power to unit using power
switch before servicing. Wires removed during disassembly must be replaced on proper terminals to insure
correct earth ground and polarization. After servicing, reconnect power using power switch.
Service Diagnostics and Procedures–Disassembly
Ice Maker
The unit uses an ice maker that consists of a mold
heater, thermostat, motor, and wire harness. The ice
maker always starts from and stops at the “park”
position. In the park position (the ejector blades
are pointing horizontally towards the back of the
ice maker). Just before reaching the park position
the mold is filled with water. At the park position
all electrical components are de-energized, even
though the shut-off arm is down, and the ice maker
is ready for the next freeze cycle.
The ice maker takes from 30 minutes to one hour
to freeze the water. The primary time factors are
the temperature in the freezer and the amount
of airflow around the ice maker. Colder freezer
settings and free air space around the ice maker to
let air circulate will help make ice faster. After the
ice forms, the ice maker continues to wait until it
reaches 15º F before it starts the harvest cycle. This
insures that the ice is solid in all the cavities. At 15º
F the thermostat closes, the mold heater turns on,
and the ejector blades rotate up and forward until
they stall out against the ice. The motor is designed
to stall out and is geared to generate a lot of
pressure. This minimizes the amount of melting
needed to extract the ice. As soon as the ice is
loose enough to move, the ejector pushes the ice
out of the mold during the second half of the first
revolution. During the second revolution the ejector
pushes the ice into the bucket.
To make ice, an ice maker needs power, water, and
sub-freezing temperatures.
Note: The freezer door switch turns off power to
the ice maker when the freezer door is open. It will
be necessary to manually close the freezer door
switch for some troubleshooting steps. Ensure that
the shut-off arm is down and instruct customer on
its use if necessary.
To ensure power to the ice maker without a meter,
remove the module cover and take note of the test
points.
Test Point Component
N
Neutral side of line
M
Motor connection
H
Heater connection
T
Thermostat connection
L
L1 side of line
V
Water valve connection
Place a 14 gauge jumper wire across test points T
and H. With hands clear of the ice maker, manually
close the freezer door switch. This will put the Ice
maker in a manual cycle. If the ejector does not
rotate, this indicates no power to the ice maker.
Trace power from the wall socket to the door switch
and to the connector. Repair circuit and connections
or replace door switch as needed. If the ejector
begins to rotate (very slowly) there is power. With
power present, verify 0VAC between test points
T and H (this verifies the thermostat has closed).
Verify heater resistance is approximately 264
1
.
With motor running, verify heater is heating.
N
M
V
L
H
T