Dometic
®
MANUAL
Refrigerators
73
SHUT-
OFF
SWITCH
LEVER
ARM
FRONT VIEW
MOTOR
MOUNTING
PLATE
TIMING CAM
WATER
VALVE
SWITCH
HOLDING
SWITCH
MOLD SWITCHES
These three switches are single-pole, double-throw
style. They are identical and interchangeable.
The holding switch assures completion of a revolution
once a cycle has started.
The water valve switch opens the water valve during
the fill stage of the cycle. NOTE: This is the only adjust-
able component of the ice maker. If you use a double-
throw switch, DO NOT use the N.O. terminal.
The shutoff switch stops the ice maker’s operation
when the storage bin is full.
TIMING MOTOR
This is a low-wattage, stall-type motor which is geared
to the timing cam and ice ejector. It is a one RPM
motor.
To check the motor, disconnect power to the appliance
and test for continuity between the two leads. If you DO
NOT have continuity, replace the motor. If you have
continuity and the motor runs, DO NOT replace.
WATER VALVE
This valve is solenoid operated. When it is open, it
releases water from the source to the mold. The amount
of water is proportional to the length of time the water
valve switch is held closed by its timing cam.
Disconnect power to the appliance, remove the wires to
the valve solenoid coil, and check for continuity between
the two terminals. If you have continuity, the solenoid is
good. It takes 10-15 watts to energize the solenoid coil.
The mold heater and coil are in series. When the mold
heater is activated, this causes the voltage to drop to
about 105 VAC at the coil.
The valve has a flow washer inside which acts as a
pressure regulator. A strainer is installed to prevent dirt,
rust, etc. from entering the valve. Check for any debris
which might obstruct the flow of water, or prevent the
valve from closing completely when the circuit is not
energized. Remove any obstructions. If the valve still
fails to operate properly, replace it.
ICE MAKER ASSEMBLY
It may be necessary to replace the entire ice maker
assembly.
Disconnect power to the appliance. Disconnect the
leads inside the ice maker unit. Check each wire for
continuity to make sure the wiring is good before
replacing the ice maker unit. If there is no continuity on
any of these wires, replace or repair them as necessary
and recheck the ice maker unit to determine whether
the problem was in the wiring or the unit itself.
2G. OPERATION
While the operation of the ice maker is fairly simple, an
understanding of its cycle is necessary for the service
technician to diagnose specific problems.
The following series of electrical schematics (on the
following pages) will show a typical cycle, and the
positions of various components during the cycle: the
mold and its contents, the ejector, the shutoff arm and
the storage bin.
NOTE: If you have difficulty in reading schematics and
circuit diagrams, please enroll in a basic electrical
course at your local school or college.
VALVE BODY
FLOW
WASHER
SOLENOID
COIL
STRAINER
WATER VALVE
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