Ice Maker Assembly; Operation - Dometic S1521 Service Tips Manual

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.
Disconnect power to the appliance and test for continuity between the two leads.
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.
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.

ICE MAKER ASSEMBLY

Check each wire for continuity to make sure the wiring is good before replacing the ice maker unit.

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.
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WATER VALVE
VALVE BODY
FLOW
WASHER
STRAINER
SOLENOID
COIL