Water Dispenser; Door Mechanism And Display Panel; Wiring; Internal Wiring - Dometic NDA1402 Service Manual

13.5 Water dispenser

When the paddle on the door dispenser is depressed call-
ing for water, a switch will be closed sending AC voltage
via the blue wire to the water valve. When activated, wa-
ter will be supplied to the door dispenser. If no water is
dispensed, check for AC voltage at W1 (Blue) coil of the
water valve assembly. If no voltage is present check the
wiring harness, or the dispenser mechanism will need to
be replaced. If voltage is present when the lever is de-
pressed and no water is dispensed, verify water supply
and check for leaks at the valve, water line & 90° elbow.
If the above checks are OK replace the water valve as-
sembly.
note:
For safety reasons, when opening the freezer
door, the ice/water dispenser and ice maker system will
automatically shut off. Closing the freezer door automati-
cally resumes operation of ice/water dispensing and ice
maker operation.

13.6 door mechanism and display Panel

The control system in the door is split into two units: One
unit with a power supply for the electronic control and four
relays for switching on the AC to the auger motor, cube/
crushed ice solenoid, water valve and the lamp. The mi-
cro switches for sensing of the water and ice paddles are
mounted separately and connected to this power supply
board. The lamp and the cable from the back side are
also connected to this board. The other unit is positioned
just behind the front display panel and has switches that
are actuated by the touch pads. The front panel also has
a central processor that controls all commands to the dis-
penser assembly. The two units are interconnected by a
flat flexible cable. However, all intelligence is on the pro-
cessor board (front panel). If the unit fails to operate, first
verify the connections of the flexible cable, and then re-
place the front panel.
this is an energized circuit. Shock can occur
if not tested properly. testing is to be done
by a qualified service technician.
To bypass the door controls and verify the operation of
the auger, solenoid and water dispenser. Remove the drip
tray and front display panel. These test can be performed
at the (6) six pin connector on the left side of the dis-
penser assembly.
Using an insulated jumper wire, jump between 120 VAC
and:
Water- Water should be dispensed.
Auger- Auger should rotate.
Cube- Solenoid should be activated.
Fice- This connection is not used.
When performing these tests, if the auger, solenoid, and
water dispenser work as intended, the problem is located
in the door mechanism, flat cable or display panel.
SectIon 14

WIrIng

14.1 Internal Wiring

Check all wires and the connectors to ensure a proper
and tight connection. Also verify the refrigerator is wired
per the wiring diagram for the model you are working on.
(See applicable wiring diagrams for your model refrigera-
tor). A loose connection can create erratic operation. Al-
ways check the wires at the DC terminal block, two wires
in and two wires out.

14.2 external Wiring

120 Volts ac connection: The refrigerator is equipped
with a three prong (grounded) plug for protection against
shock hazards and should be plugged directly into a prop-
erly grounded three prong receptacle. do not cut or re-
move the grounding prong from this plug.
12 Volt connection: The connection is made to the ter-
minal block marked 12 volts DC. The control system is
connected to a battery/converter circuit and could draw
about 3 amps (7 amps if defrosting) at 12 volts DC. The
refrigerator must be connected to the battery circuit with
two wires of adequate capacity to avoid a voltage drop.
Proper polarity is crucial for refrigerator operation. don't
use the chassis for the ground circuit. no other elec-
trical equipment or lighting should be connected to
refrigerator circuit. A loose connection will create erratic
operation.

14.3 Wiring Schematics

To view typical wiring schematics look in the Lower Circuit
board testing section 5, pages 19, 20 and 21. All units
should have a specific schematic on the rear of that unit.
To acquire the proper wiring schematic always have the
product number when you call or e-mail.
do not use a flame to check for gas leaks.
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