When ordering parts, always state:
MODEL NO. - PRODUCT NO. - QUANTITY PART NUMBER - DESCRIPTION
For Electric Details also state:
VOLTAGE - WATTAGE
MODEL
NDA1402
Refrigerator
USA
SERVICE OFFICE
Dometic Corporation
2320 Industrial Parkway
Elkhart, IN 46516
574-294-2511
CANADA
Dometic Corporation
46 Zatonski, Unit 3
Brantford, ON N3T 5L8
CANADA
519-720-9578
For Service Center
Assistance Call:
800-544-4881
Product
No.
Model
Voltage
921148271 NDA1402 120VAC
Refrig Frame
Color
Door
Style
Door/Door
Trim Color
Market
BLACK
Surround
Stainless
USA/Can Dometic
PARTS LIST
FORM NO. 3311097.000 11/06
©2006 DOMETIC CORPORATION
LAGRANGE, IN 46761
Brand
MODEL
NDA1402
NDA1402 PARTS LIST
ALPHABETICAL INDEX
PAGE
INDEX NO.
Cabinet, Exterior Parts
5-6
2-108
Cabinet, Freezer Parts
15-16
6-136
Cabinet, Ice Maker Parts
9-10
80-125
Cabinet, Interior
7-8
3-130
Control & Burner
11-12
1-253
Cooling Unit
13-14
100-141
Door Assembly
3-4
1-95
Door Dispencer
19-20
1-72
Ice Maker Parts
17-18
1-61
Wiring Diagram
21-22
SPECIFICATIONS
Product No.*
921148271
Energy Source**
120VAC/Gas
AC Heating Element
Watts
210 ea
Ohms
69
Amperage
1.75
BTU’s Gas Burner
2080
Jet Size
#76
Flue Baffle
Size
6” x 15/16”
Position Above Burner
1-1/4”
Ice Bucket
1
Crispers
2
Bottle Holders
5
Climate Control Heater
Watts
6
Ohms
24
Amperage
0.5
*Product number located on refrigerator data plate
** 12Volt DC power is required to operate the refrigerator
controls on this model
2
NDA1402 PARTS LIST
DOOR ASSEMBLY PARTS
3
NDA1402 PARTS LIST
DOOR ASSEMBLY PARTS
INDEX
1
2
4
7
8
9
11
12
13
17
18
19
20
30
31
32
40
41
42
43
44
45
46
50
95
PART NO.
3850426036
3850427034
3850386016
3850492012
3850499017
3858040029
2932583046
3850445010
2932577030
2932658012
3850459011
2932722005
2932722008
3850581004
3850431010
3850447016
3850447024
3850495015
3850495023
3850497011
3850496013
3858056041
3850498019
3858034048
3850775010
3850385026
MODEL
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
DESCRIPTION
Door, refrigerator
Door, Freeer
Hinge bushing, Black
Handle, Black
Control know, Black
Screw ELM 5x10, Black
Door Shelf
Door Shelf
Door Shelf
Bottle Holder
Rack
Door Shelf
Label
Label, French
Door shelf, wire
Holder, Door shelf LH
Holder Door Shelf RH
Lock Bar
Lock Bar
Spring
Plate
Screw, MFX M4x13, black
Lock Washer
Retaining Ring
Door Stop
Name Plate
4
NDA1402 PARTS LIST
CABINET EXTERIOR PARTS
5
NDA1402 PARTS LIST
CABINET EXTERIOR PARTS
INDEX
2
4
5
10
18
21
24
33
34
36
38
39
41
60
86
95
97
105
106
107
108
PART NO.
3850400015
3850398011
3850398026
2931715011
3850682018
3850460019
3858006012
3850461017
3850462015
3850397013
3850399019
3858010022
3850456017
2932664093
3858004108
3851128011
3850693007
3858004041
3858039104
3858010113
3858009057
MODEL
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
6
DESCRIPTION
Hinge Pin, Upper
Hinge, Upper, Black
Hinge, Upper, Black
Lid
Panel Display Board, Black
Front Black
Scrrew PH4x10
Holder, Lock, Upper
Holder, Lock, Lower
Hinge, Lower Black
Hinge Pin, Lower
Washer, Black
Switch
Base Cover, Black
Screw, MRX 5x25
Spacer, Plastic, Black
Label
Screw, MRX 4x6 FZ
Screw, MRX-TT M4x10 Black
Washer, BRB 6.4x12.5
Nut, ML6 M6, Black
NDA1402 PARTS LIST
CABINET INTERIOR PARTS
7
NDA1402 PARTS LIST
CABINET INTERIOR PARTS
INDEX
3
4
5
6
8
10
11
12
13
14
15
16
19
21
22
23
24
26
32
42
43
44A
45
46
47
48
49
61
62
64
65
74
75
76
111
114
115
116
120
121
130
PART NO.
3850473020
3850473038
2931117192
2931117184
2931714022
3850435011
3850436019
3850437017
3850438015
3850440011
3850439013
3850441019
3850442017
2932102011
2932101013
2932103019
3858006012
3850449012
2932108018
3850962014
2007290006
2007337153
2007337237
2930693045
2007337245
3850963012
3850961016
3850430012
3850444013
3850484019
3850485016
3858062023
3850486014
3850448014
3850433016
3850726013
3850752019
3850655014
2007393024
2007392026
3858039013
MODEL
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
8
DESCRIPTION
Cooling Fins RH
Cooling Fins LH
Shelf, Plastic
Shelf, Plastic
Outlet
Shelf
Shelf
Shelf
Shelf
Shelf
Shelf
Shelf
Crisper
Shelf Support
Plug
Plug
Screw PH4x10
Drip tray
Contact Pin
Lamp Glass
Lamp, 10W 12VDC
Rack
Rack
Holder
Rack
Reflector
Lamp Housing
Basket, Wire
Front, Wire, Basket
Holder, Outer
Holder, Inner
Terminal Black
Fan
Cover, Fan
Shelf
Shelf
Ice Box
Box
Stop Outside
Stop, Inside
Screw, MRX-TT/SW 4x8
NDA1402 PARTS LIST
CABINET ICE MAKER PARTS
9
NDA1402 PARTS LIST
CABINET ICE MAKER PARTS
INDEX
80
90
95
102
106
113
120
125
PART NO.
2930841016
3108706.270
2930839010
3850220017
3105349.009
2932147016
3850688015
2954559023
MODEL
A
A
A
A
A
A
A
A
10
DESCRIPTION
Insert Filler
Valve, water
Nut
Insert, Copper Water inlet valve
Connection
Ice Maker, Complete
Kit, Heater water valve
Harness, wire
NDA1402 PARTS LIST
CONTROL & BURNER PARTS
11
NDA1402 PARTS LIST
CONTROL & BURNER PARTS
INDEX
1
17
18
19
20
21
25
31
33
34
39
40
41
45
51
54
55
56
57
68
70
72
84
85
89
91
152
160
161
162
163
164
250
251
252
253
PART NO.
0140207044
3858039039
2932161017
3858002144
2932615020
3858002151
3858010071
0955001672
2932781020
3858002052
2932061020
2932032010
3850710017
3850681010
2007419332
2932667054
2932662014
3858039047
2932043017
3850644539
2007457001
3850708011
3858022019
3858002185
3850777016
3858002177
2931401018
2954547028
2954557019
3850680012
3850680020
2954555013
3858004033
3858011012
3858009016
3858028024
MODEL
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
12
DESCRIPTION
Nut
Screw, MRX M4x8
Burner Housing
Screw, RXS B6x9
Solenoid Valve
Screw RXS B6x13
Washer
Burner Pipe
Electrode
Screw, RXS B6x6.5
Bracket
Holder
Bracket
Power Module
Jet #76
Flame Spredader
Bracket
Screw, MRX M4x10
Support Plate
Heater 210W 120VAC
Washer
Burner Control
Terminal Block
Screw, RXS B6x25
Bracket, Valve Water
Cover
Cover
Conductor, Burner Control
Conductor, Solenoid Valve
Conductor Thermistor, Refr
Conductor Thermistor Freezer
Harness
Screw MRX M4x16
Lock Washer
Hex Nut
Lock Nut
NDA1402 PARTS LIST
COOLING UNIT PARTS
13
NDA1402 PARTS LIST
COOLING UNIT PARTS
INDEX
100
101
102
110
112
113
114
115
116
117
120
135
140
141
PART NO.
2934948106
0173228008
2933557023
3850600010
2932115013
2932733005
2002699110
2932749035
2932635010
2932749100
2002699177
2932155019
3850582002
3850583000
MODEL
A
A
A
A
A
A
A
A
A
A
A
A
A
A
14
DESCRIPTION
Cooling Unit w/fuse, Type 948
Cap
Flap
Blow out protection
Discharge Pipe Plug
Label
Cord
Drain Hose
Drain
Drain Hose
Cord
Support Plate
Label
Label
NDA1402 PARTS LIST
CABINET, FREEZER PARTS
15
INDEX
6
8
11
20
21
22
25
26
30
35
40
41
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
70
71
75
83
84
85
135
136
PART NO.
3858041027
3858009073
3858010121
3850674015
3850675012
3850676010
3850629019
3858006046
3850486022
0165521030
3850677018
3850678016
3850648019
3850649017
3850650015
3850651013
3850652011
3850656012
3850658018
3850659016
3850660014
3850661012
3850679014
3858040037
3858002268
3858004165
3858028032
3858004173
3850657010
3858002235
3850896014
3850666011
3850667019
3850734017
3850668017
3850669015
MODEL
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
DESCRIPTION
Screw, M6S 5x25 A2-80
Nut, ML6 M5
Washer BRB 6.4x12.5
Heating Element, Refrigerator
Heating Element, Freezer
Heating Element, Water Drain
Cooling Fin, Freezer
Screw, PT 30x12
Fan, Freezer
Rivet, Expansion
Terminal Box, Bottom
Terminal Box, Cover
Suction Channel
Motor Bracket
Air Distributor
Cover,W/drip Pan
Insluation, Cover, Drip Pan
Support Strip
Drainage Hose
Sealing Strip
Sealing Strip Cooling Fins
Locking Pin
Bracket Thermistor
Screw, EML 5x12
Screw RXS B8x19
Screw, MRX M4x40
Lock Nut, M4
Screw, MRX M4x10
Support
Screw, RXS, B6x9.5
Insulation
Shelf, ice maker
Plate
Sealing Strip
Cover, outer Insulation
Insulating Plate
NDA1402 PARTS LIST
WIRING DIAGRAM
17
NDA1402 PARTS LIST
WIRING DIAGRAM
18
Frost Checklist and
Troubleshooting
Guide for
NDA1402 & NEA1402
USA
SERVICE OFFICE
Dometic Corporation
2320 Industrial Parkway
Elkhart, IN 46516
574-294-2511
CANADA
Dometic Distribution
46 Zatonski Unit 3
Brantford, Ontario
CANADA N3T 5L8
519-720-9578
For Service Center
Assistance Call:
800-544-4881
Form No. 3312186.000 11/07
©2007 Dometic Corporation
LaGrange, IN. 46761 USA
REFRIGERATOR
BULLETIN R82-7A
NOVEMBER 2007
SYMPTOM
CAUSE
LOCATION
1. Ice around Ice maker
Water fill set too high
Fill tube not positioned correctly
Box not sealed around fill tube
Box not sealed around wall entrances
Freezer door gasket not sealing
Needs auxiliary defrost fan
Voltage
Real time clock not set
Failed defrost cycle
Page 4, Section 4
Page 5, Section 5
Page 5, Section 6
Page 5, Section 6
Page 4, Section 3
Page 3, Section 2
Page 7, Section 12
Page 7, Section 13
Page 7, Section 15
2. Frost around drain tube (Freezer)
Drain tube orifice too small
Drain tube clogged
Drain tube heater inoperative
Needs auxiliary defrost fan
Freezer door gasket not sealing
Drain cap not in place
Voltage
Box not sealed around fill tube
Box not sealed around wall entrances
Real time clock not set
Failed defrost cycle
Page 5, Section 7
Page 5, Section 7
Page 6, Section 9
Page 3, Section 2
Page 4, Section 3
Page 5, Section 6
Page 7, Section 12
Page 5, Section 6
Page 5, Section 6
Page 7, Section 13
Page 7, Section 15
3. General frost (Freezer)
Freezer door gasket not sealing
Drain cap not in place
Needs auxiliary defrost fan
Freezer heating element inoperative
Drain tube heater inoperative
Voltage
Box not sealed around fill tube
Box not sealed around wall entrances
Real time clock not set
Failed defrost cycle
Drain hose Split
Page 4, Section 3
Page 5, Section 6
Page 3, Section 2
Page 6, Section 10
Page 5, Section 9
Page 7, Section 12
Page 5, Section 6
Page 5, Section 6
Page 7, Section 13
Page 7, Section 15
Page 6, Section 8
4. General frost (Fresh Food)
Drain tube orifice too small
Drain tube heater inoperative
Fridge heating element
Voltage
Box not sealed around wall entrances
Real time clock not set
Failed defrost cycle
Page 5, Section 7
Page 6, Section 9
Page 7, Section 14
Page 7, Section 12
Page 5, Section 6
Page 7, Section 13
Page 7, Section 15
5. Water/condensation at the dispenser
Ice shutter not closing
Ice shutter heater inoperative
Too warm in coach
Water fill set to high
Fill tube not positioned correctly
Page 6, Section 11
Page 6, Section 11
Page 3, Section 1
Page 4, Section 4
Page 5, Section 5
2
SAFETY INSTRUCTIONS
INTRODUCTION
This Bulletin is applicable for the NDA1402 & NDE1402
model refrigerators. It primarily deals with Frost and Ice
issues in the freezer section regarding the auto defrost
system.
This bulletin has safety information and instructions to
help users eliminate or reduce the risk of accidents and
injuries.
TOOLS REQUIRED
The refrigerator can be checked with a Phillips screwdriver
and a multimeter for checking resistance.
CHECKLIST
Perform the following tasks.
•
•
•
•
•
•
•
•
Make sure the freezer door is sealing properly.
Check if the water supply for the ice maker needs
adjusting.
Verify that the ice maker water fill tube is in
place.
Check the cabinets wall entrances for wire harnesses and fill tube sealing.
Make sure the drain plug at the bottom of the
freezer is in place.
Inspect the drainage tube to see if it’s blocked or
if the orifice needs to be increased.
Check if the drainage heater is looped and measure the resistance.
Verify that the ice shutter is working/sealing properly.
IMPORTANT
The Refrigerator must be completely defrosted before
repairs are completed to ensure proper operation.
1. INTERIOR COACH TEMPERATURE
If the interior of the coach is not air conditioned, allowing
for higher temperatures and humidity in the inside of the
coach, it’s possible to get condensation running out of the
dispensing area of the freezer door and onto the floor.
2. AUXILIARY DEFROST FAN KIT
Refrigerators with serial numbers below 707XXXXX may
require an auxiliary fan kit to be installed for proper defrosting. Contact Technical Service at 800-216-5115 to
order an auxiliary fan kit (Part# 385130901). The Refrigerator must be completely defrosted before repairs are
completed to ensure proper operation.
3
4. WATER FILL/SUPPLY
3. FREEZER DOOR GASKET
Check the gasket on the doors to be sure of a positive air
seal. A simple method to check gaskets is to close the door
on a dollar bill, then pull the dollar bill out. If no resistance
is felt, the gasket in that place is not sealing properly. This
should be done on all sides of the door in several places.
For freezer doors not sealing at the angled portion of the
door, replace the sealing strip mounted under the gasket.
For refrigerators lacking this strip, install strip under the
door gasket. See Fig. 1.
Check the ice maker and make sure the mold is not overfilled and leaking water.
To prevent the mold from being overfilled with water, regulate the water supply by removing the cover and turn the
adjusting screw (1 turn = 20 cc). See Fig. 3.
Note: The amount of water varies depending on water
pressure.
Fig. 3
Adjusting screw for
regulating the water
supply
If a gasket is not sealing properly, lift up inside of door
gasket and insert 1/4” ball of fiberglass insulation at all
corners of the door. Next warm the gasket material with
a hair dryer. Then close the door and the magnetic strip
should pull the gasket to the metal frame. Leave the door
closed until the material has cooled. Then recheck for a
positive seal. If a positive seal cannot be achieved, replace the door gasket.
Clockwise to reduce
Counter-clockwise to increase
In some cases a foaming/overspray will be noticed around
the fill cup area. This may be noticed if the water pressure
is unregulated or in excess of 40-50 psi.
Note: Air leaks will cause insufficient cooling as well as
rapid formation of frost.
To determine if foaming/overspray is happening:
• Disconnect city water supply.
• Turn water pump switch on.
• Set the ice maker water supply line shut-off valve
to “full open”.
• Remove ice bin.
• Remove cover from face of ice maker.
• Rotate ice maker main gear/sprocket using
channel-lock pliers until bail arm begins to lift.
• Depress & hold freezer door switch (to allow AC
power to pass into freezer compartment & ice
maker).
• Allow ice maker to cycle.
• Just before end of cycle observe water fill at rear
of ice maker (shine flashlight into compartment
and observe cup).
Fig. 1
Also, you can test the overspray scenario with city water
supply as well by reversing steps 1 & 2 to shut off the water pump and connect to city water supply.
If foaming/spraying occurs:
Open the freezer door and gently fold back the gasket in
order to check the condition of the sealing strip. Replace
or install a new sealing strip if necessary. See Figs. 2 &
2A.
Fig. 2
1. Inspect/Replace water line insert.
•
Fig. 2A
The larger insert (.140 ID) allows for greater flow
and greater possibility of overspray. The recommended size should be (.125 ID). See Fig. 4.
Fig. 4
.140 ID
4
.125 ID
•
•
•
6. WALL ENTRANCES
The insert needs to be partially (not fully) inserted
into the clear tubing. See Fig. 5.
Clear tube and insert need to be inserted into the
angled fill tube so that the insert is flush with the
edge of the fill tube. See Figs. 6 & 6A.
Spring clip needs be positioned so that it is firmly
pinching down onto metal insert. See Figs. 6 & 6A.
To prevent air leaks from the outside, it is vital to make
sure that wall entrances have been sealed properly and
that the drain plug is inserted at the bottom of the freezer
compartment. See Figs. 8 & 9.
Verify that the wall entrances for the wire harnesses and
for the ice maker fill tube have been sealed properly. If
necessary, apply a putty type sealant around the openings from the inside as well as from the outside.
Fig. 5
In most applications, removing the upper side wall vent
will access the entrance points. For applications using a
roof vent, removal of the refrigerator may be necessary.
Approx. 1/4”
Fig. 8
Fig. 6
Wire harness
Fig. 6A
Ice maker fill tube
and wire harness
Incorrect
Correct
Locate the drain plug at the bottom of the freezer compartment. Make sure the drain plug is in place. If the plug
is missing, install with a new one. See Fig. 9.
In most applications, removing the upper side wall vent
will provide access to the ice maker fill tube. For applications using a roof vent, removal of the refrigerator may be
necessary.
Fig. 9
2. Reduce the flow of water into ice maker.
• A permanent fix would be to regulate the water
supply using a pressure reducing valve before
the inlet side of our water solenoid valve (regulate between 40 and 50 psi).
• A temporary solution in-the-field would be to
turn the manual shut-off valve “OFF”. And
then reopen the valve approx 1/4 turn (less if
a “ball” type valve is used)
7. DRAIN TUBE
5. ICE MAKER FILL TUBE
The drainage tube must be free from anything blocking
the passage. The required orifice dimension is 1/4”.
Check the drainage tube for blockage, ice, dirt etc. and
clean if necessary. If the orifice dimension is smaller than
1/4”, use a sharp tool to increase the orifice size. See Fig.
10.
To avoid the risk of water leakage outside the inlet, make
sure the ice maker fill tube (located behind the ice maker)
is inserted far enough in the ice maker water inlet cup.
See Fig. 7.
Fig. 7
Fig. 10
Use your fingers to verify that the fill tube is protruding
approx. 1/2” into fill cup.
5
Check orifice diameter. Should be ¼”
8. DRAIN HOSE
10. FREEZER HEATING ELEMENT
Excessive frost or moisture can occur if the drain hose
on the back of the refrigerator is split or broken allowing
warm air back into the fresh food or freezer compartment.
Check to make sure that the hose is sealed and the drain
plug or flapper/check valve is installed in the end of the
hose.
Shock Hazard. The 120 VAC electrical power supply
to the refrigerator must be turned “OFF” prior to testing the freezer heating element. Failure to heed this
warning may cause death or severe personal injury.
9. DRAIN TUBE HEATER
Check the resistance of the freezer surface heater. To
measure the resistance of the heater, remove the cover
of the main control board on the back of the refrigerator.
Remove red wire from J5 terminal and black wire from
J1 terminal from lower pc board. Measure the resistance
between these two wires. The resistance reading should
be 2 ohm’s +/- 10%. The refrigerator should be defrosted
prior to this test to avoid erroneous readings. Frost/Ice
could conduct current hiding an open circuit in the heater.
See Fig. 12.
Shock Hazard. The 120 VAC electrical power supply
to the refrigerator must be turned “OFF” prior to testing the drain tube heater. Failure to heed this warning
may cause death or severe personal injury.
•
•
Ensure the drainage heater is not looped or folded over. See Fig. 11.
Check the resistance of the heater. To measure
the resistance of the heater, remove the cover of
the main control board on the back of the refrigerator. Remove P5 cable from lower pc board.
Measure resistance between pin 5 white wire and
pin 2 yellow wire. You should have a resistance
reading of approximately 12.5 ohm’s +/- 10%.
The refrigerator should be defrosted prior to this
test to avoid erroneous readings. Frost/Ice could
conduct current hiding an open circuit in the heater. See Fig. 12.
11. ICE SHUTTER
Ensure the ice shutter closes properly. Give the shutter a
little push and watch it close completely. Verify for debris
on the shutter that does not allow for a tight seal. If it is not
working as intended, the dispenser mechanism should be
disassembled for troubleshooting. See Fig. 13.
Fig. 13
Fig. 11
Check Shutter
Verify the portion extending into the
drain tube is not looped or folded
over to itself.
Shock Hazard. The 120 VAC electrical power supply
to the refrigerator must be turned “OFF” prior to testing the heating element. Failure to heed this warning
may cause death or severe personal injury.
Fig. 12
J1
P5
J5
6
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 floor.
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.
14. FRIDGE HEATING ELEMENT
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 connector. The resistance should be approximately 7220 ohms
+/- 10%. See Fig. 14.
Shock Hazard. The 120 VAC electrical power supply
to the refrigerator must be turned “OFF” prior to testing the fridge heating element. Failure to heed this
warning may cause death or severe personal injury.
Fig. 14
Check the resistance of the heater. To measure the resistance of the heater, remove the cover of the main control
board on the back of the refrigerator. Remove P5 cable
from lower pc board. Measure resistance between pin 6
red wire and pin 3 black wire. You should have a resistance reading of approximately 3.6 ohm’s +/- 10%. See
Fig. 12.
15. AUTOMATIC DEFROSTING
Defrosting is initiated automatically every 24 hours, at
1:00 AM. However, a defrosting is only initiated if the temperature in the freezer is lower than 18° F at 1:00 AM. If
the battery voltage is lower than 10.5 VDC the defrosting start is delayed until the battery voltage is restored.
If it is not restored within 3 hours, the defrosting will be
skipped.
HEATER WIRE
12. VOLTAGE AND WIRE GAUGE
All the defrosting elements operate on 12 VDC. Necessary voltage is >10.5 VDC during active defrost.
Note: The defrosting cycle will not start if the voltage is
below 10.5 VDC. It is important that the wires to the 12
VDC terminal are of proper wire size.
•
•
Note: There is a blocking function that inhibits automatic
defrosting during the first 24 hours after the refrigerator is
switched “ON”. This 24 hour blocking function is re initialized every time the refrigerator is switched “OFF” for more
than one hour.
Check the DC supply.
Check wire gauge to ensure that it is in accordance with recommended dimensions.
Length (ft)
Min. size (AWG)
< 33 12
33-66 10
> 66 8
Temperature “pull down”
When a defrosting is initiated, the first thing that happens is that the refrigerator pulls down the compartment temperatures to thermostat “cut out” levels. If
these levels are not reached within one hour, the defrosting sequence starts anyway.
13. REAL TIME CLOCK
To get the best performance from the refrigerator, defrosting is performed when the least amount of demand is
on the refrigerator. Therefore the refrigerator has a real
time clock that controls the defrosting process. The clock
runs even if the refrigerator is switched “OFF”. However,
if the +12 VDC supply (battery voltage) is disconnected,
the clock will continue to run only about three weeks. So
if battery voltage has been disconnected for more than
three weeks, the clock must be set again. This will be indicated by horizontal bars (- - - -) in all four, seven-segment
displays. Even if this “clock not set” warning is not shown,
the clock should be checked at regular intervals (at least
once per year) to ascertain that the time setting is correct.
It is also recommended to set the clock when entering a
different time zone.
Cooling unit relax time
After the temperature pull down period, the real defrosting sequence is started. The cooling unit is now
switched “OFF”, but nothing more happens for 10
minutes to let the cooling unit relax.
Heating in the freezer
After the relaxing period, the heating elements in the
freezer and in the water drain are switched “ON”.
The fan in the freezer is at the same time stopped to
prevent the food from being heated by hot air.
The heating stops when the temperature on the cooling surfaces has reached 41° F or when 75 minutes
has elapsed. If the heating is stopped by the time criteria, the defrosting is treated as incomplete. An incomplete defrosting could depend on either extreme
ice on the cooling surface, or that the battery voltage
has became so low that the heating effect was insufficient.
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Cancelling of an automatically initiated defrosting
The heating is also stopped before the defrosting is
completed if the battery voltage drops below the battery protection level.
If, for some reason an automatically initiated defrosting needs to be cancelled. Enter the “Service mode”.
Then switch the refrigerator “OFF” and then “ON”
again. This cancelling will not work immediately after
the defrosting is initiated a 1:00 AM. Wait at least
three minutes before trying to cancel the defrosting.
If 2 incomplete defrostings occur in a row, the warning message “Er 01” is displayed.
Note: The WARNING “Er 01” indicates that 2 or
more consecutive defrosting attempts failed. This
message will disappear when a defrosting has completed successfully. But it will also be cleared if power is switched “OFF” and then “ON”.
16. ENTERING THE SERVICE MODE
Before entering the “Service mode”, switch “OFF” the
refrigerator with the “ON/OFF” button. To enter the service mode, press and hold the “SET” button then press
“ON/OFF” button to the “ON” position. In this mode the
refrigerator is not operating normally. Instead a number of
tests can be performed and the “SET” button is used to
step through the tests. The test number and the result of
the test are displayed alternating (flashed). Stepping beyond the last test will result in a restart from test number 1
again. The refrigerator will automatically exit the “Service
mode” if no action is detected for 3 minutes. To manually exit, switch the refrigerator “OFF” and then back “ON”
again.
Heating in the fridge
After the defrosting of the freezer, the cooling unit
is restarted again. It takes some time before cold is
produced and during that period, the defrosting in
the fridge now takes place. After a one minute delay,
the heating element in the fridge is switched “ON”.
The fan in the fridge is stopped during this defrosting cycle. The heating element in the water drain line
remains “ON”.
The defrosting in the fridge is terminated when the
temperature on the cooling surfaces has reached
41° F or when 20 minutes has elapsed.
After the defrosting, normal thermostatic operation is
restarted again. However, the heating element in the
water drain is still “ON” for some time. It is switched
“OFF” 30 minutes after the start of the fridge defrosting period.
17. MANUAL DEFROSTING
A manually initiated defrosting will start if the “AUTO/
STORE” button is held down during “power up”. However,
if the freezer door is open during this initiation, a drying up
period is instead started. (See below). A manually initiated
defrosting is identical to an automatically initiated defrosting with the exception that the defrosting sequence starts
immediately with the “relaxing period”, that is without any
initial temperature “pull down” period. A manually initiated
defrosting may be cancelled at any time just by switching the refrigerator “OFF” and then “ON” by means of the
“ON/OFF” button. However, a short 12 VDC power break
will not cancel the defrosting.
Freezer fan operation during and after a defrosting
The fan in the freezer is stopped during defrosting in
the freezer, but it is started for short periods at certain intervals for testing and to prevent it from being
blocked. A permanently blocked fan will result in the
error code “Er 02”.This error message is also shown
if the fan is permanently blocked during normal thermostatic operation.
18. DRYING FUNCTION
After a defrosting, the fan in the freezer is not started
until the temperature on the cooling surfaces becomes colder than the air temperature in the freezer.
When the refrigerator is to be off for some time, the compartments must have a chance to dry up to prevent mold
from forming. The doors should then be left open. However, the cooling surfaces in the freezer will dry very slowly
as they are well encapsulated and the air convection is
small. Therefore the refrigerator has a feature that can
speed up the drying up of the freezer. To initiate this drying function, start the refrigerator with the “AUTO/STORE”
button held down and the freezer door open. If required,
the drying function starts with a defrosting. The drying
period will take about 3 hours (longer if a defrosting is
first performed). Afterwards the refrigerator is automatically switched off. The drying function may be terminated
by switching off the refrigerator or by closing the freezer
door.
Note: The warning “Er 02” indicates that the fan in
the freezer is blocked (by ice probably). As soon as
the fan can move again, this message disappears.
The fan has to be blocked for at least one hour before this message is shown. When the fan is “OK” it
will only be a delay of about one minute before the
message is cleared.
Power breaks during a defrosting
If the +12 VDC is removed for short periods of time
or if the refrigerator is switched “OFF” and then “ON”
again during a automatic defrost, the defrosting will
continue from the point where it was interrupted.
However, if power has been “OFF” for more than one
hour, the remaining part of the defrost is skipped.
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TROUBLESHOOTING RECORD FORM FOR NDA/NDE1402
Product # .................................................................................................................................................................................
Serial # ....................................................................................................................................................................................
Notified Error Codes ...............................................................................................................................................................
Checklist results:
Task
Checked
Comments
1. Freezer door gasket
2. Water supply
3. Ice maker fill tube
4. Wall entrances
5. Drainage tube
6. Drainage heater
7. Ice shutter
8. DC voltage and wire gauge
Comments ..............................................................................................................................................................
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