Dometic NDA1402 - Solenoid; Ice Shutter

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13.3 Solenoid
The solenoid is only activated when calling for cubed ice.
When the paddle on the door dispenser is depressed call-
ing for ice, a switch will be closed sending AC voltage
via the red wire (solenoid) and yellow wire (auger) to the
interface module. These contacts on the interface module
are bridged separately and internally send AC voltage to
the solenoid and auger motor. When the solenoid is ac-
tivated, it will raise the lever in the ice bin, lifting a small
door. As the auger motor rotates, this pushes the ice for-
ward in the ice bin bypassing the crushing ngers, provid-
ing cubed ice down through a chute to the door dispenser.
To check the solenoid, disconnect the 120 volt AC supply
to the interface module. Measure the resistance between
the wires on terminals (J8) and (J3) of the interface mod-
ule. The resistance should be 33.0 Ohms +/- 10%. The
resistance can also be checked directly at the solenoid
assembly. This will require removal of the auger motor
along the back wall of the freezer just behind the ice bin.
NOTE: When crushed ice is called for, the solenoid will
not be activated. This forces the lever to remain down,
forcing the ice through the crushing ngers in the ice bin
and down through the chute to the dispenser.
Excessive frost around the solenoid may prevent the ice
bin lever from rising. This will result in crushed ice, re-
gardless of the request from the door controls.
This is an energized circuit. Shock can occur
if not tested properly. Testing is to be done
by a qualied service technician.
13.4 Ice Shutter
Ensure the ice shutter closes properly. Give the shutter
a gentle push and watch to see if it closes completely.
Verify for debris on the shutter that does not allow for a
tight seal. If the shutter is not sealing as intended, the
dispenser mechanism should be replaced.
The ice shutter is a door that holds back the ice into the
ice bin when the dispenser is not in use. When the paddle
for ice is depressed, the shutter will open allowing ice to
pass through. If the interior of the coach is not air condi-
tioned, allowing for higher temperatures and humidity, a
small amount of condensation may form on the shutter
area. In some cases it can develop to such a degree that
it will run down the freezer door and into the living area of
the coach. As the humidity is reduced, the condensation
will decrease.
Check Shutter
There is a heater on the door that the shutter rests
against. If the heater is inoperative this could allow for
condensation in the door that could run out onto the oor.
The shutter heater wires are located behind the dispenser
controls. To access the heater wires remove the water
drip tray at the bottom of the dispenser located on the
outside of the freezer door. This will expose three screws
holding the trim strip to the freezer door. Once the screws
have been removed lift the trim up and pull outward at
the bottom to remove the trim. Then locate and remove
the three screws attaching the dispenser controls to the
freezer door. This will expose the heater wires.
This is an energized circuit. Shock can occur
if not tested properly. Testing is to be done
by a qualied service technician.
An Ohms test should be performed on the two clear wires
going into the freezer door separate from the larger wire
harness by measuring across the two pins in the connec-
tor. The resistance should be approximately 7220 Ohms
+/- 10%.
HEATER WIRE
Excessive ice or frost
will cause the solenoid
to stick
33.0 Ohms +/- 10%