Dometic NDA1402 Service Manual
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Dometic NDA1402 Service Manual

Dometic NDA1402 Service Manual

With auto defrost
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See also: User Manual , Installation Manual
DIAGNOSTIC SERVICE MANUAL
NDA1402 & NDE1402
WITH AUTO DEFROST
USA
Dometic, LLC.
2320 Industrial Parkway
Elkhart, IN. 46516
574-294-2511
CANADA
Dometic, LLC.
46 Zatonski Unit 3
Brantford, Ontario
CANADA N3T 5L8
519-720-9578
Form No. 3312260.000 06/08
©2008 Dometic, LLC.
LaGrange, IN. 46761 USA

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  • Page 1 DIAGNOSTIC SERVICE MANUAL NDA1402 & NDE1402 WITH AUTO DEFROST Dometic, LLC. 2320 Industrial Parkway Elkhart, IN. 46516 574-294-2511 CANADA Dometic, LLC. 46 Zatonski Unit 3 Brantford, Ontario CANADA N3T 5L8 519-720-9578 Form No. 3312260.000 06/08 ©2008 Dometic, LLC. LaGrange, IN. 46761 USA...
  • Page 2 This service manual is the result of the dedica- This manual has safety information and instruc- tion of Dometic, LLC technical staff and its en- tions to help users eliminate or reduce the risk gineers in giving service people the necessary of accidents and injuries.

  • Page 3: Table Of Contents

    contentS Page no. DIAGNOSTIC FLOW CHART ................6 SectIon 1 oVerVIeW/oPeratIon Refrigerator Overview/Operation................9 SectIon 2 ac Voltage AC Voltage Requirements...................12 SectIon 3 ac comPonentS 3.1 Heating Element..................12 3.2 Interface Module..................13 3.3 AC Sensing....................14 SectIon 4 dc Voltage 4.1 DC Voltage Requirements ............... ..14 4.2 Grounds......................14 SectIon 5 dc comPonentS...
  • Page 4 contentS Page no. SectIon 7 lP gaS comPonentS 7.1 Manual Gas Shutoff Valve................22 7.2 Orifice.......................22 7.3 Burner.......................23 7.4 Flue Baffle....................23 7.5 Flue Cap....................23 7.6 Flue Tube....................23 SectIon 8 coolIng unIt 8.1 Cooling Unit.....................23 8.2 Ventilation....................25 8.3 Ventilator Fans..................27 8.4 Leveling....................27 8.5 Food Storage...................27 8.6 Ambient Temperature................27 SectIon 9...
  • Page 5 contentS Page no. SectIon 11 trouBleSHootIng 11.1 Status Messages..................33 11.2 Error Codes.....................34 11.3 Service Mode..................36 SectIon 12 Ice maKer 12.1 Operation...................38 12.2 Mold Heater...................38 12.3 Ice Ejector....................38 12.4 Mold Thermostat..................39 12.5 Shutoff Arm....................39 12.6 Mold Switches..................39 12.7 Timing Motor..................39 12.8 Water Valve...................39 12.9...
  • Page 6 This service manual will address the most common system problems associated with the NDA 1402 and NDE 1402 refrig- erators supplied by Dometic, LLC. Our intent is to provide you with a guideline of checks to make, should you encounter one of the following symptoms.
  • Page 7 This service manual will address the most common system problems associated with the NDA 1402 and NDE 1402 refrig- erators supplied by Dometic, LLC. Our intent is to provide you with a guideline of checks to make, should you encounter one of the following symptoms.
  • Page 8 This service manual will address the most common system problems associated with the NDA 1402 and NDE 1402 refrig- erators supplied by Dometic, LLC. Our intent is to provide you with a guideline of checks to make, should you encounter one of the following symptoms.

  • Page 9: Refrigerator Overview/Operation

    • Real time clock/ PM indication (temporary during setting). nda1402: This refrigerator is equipped with an automatic • Various status and error messages. energy selector system which automatically selects the most suitable energy source that is available, either 120 Store functIon volt AC or LP gas operation.
  • Page 10 SyStem dot will be off and the GAS indication dot is lit. This mode The NDA1402 model is equipped with an automatic ener- provides LP gas operation only. The control system will gy selector control system. The user turns the refrigerator...
  • Page 11 Turn on the refrigerator by pressing the ON/OFF but- other, based on the actual air temperature in each com- ton. partment. NDA1402: • The freezer setting is pre-set (can not be changed) to be approx. 0°F (-18°C) when running on AC. If run- ning on GAS the pre-set temperature is approx.

  • Page 12: Ac Voltage

    SectIon 2 ac Voltage ac Voltage reQuIrementS this is an energized circuit. Shock can occur if not tested properly. testing is to be done by a qualified service technician. The drip tray catches small spills. The tray is removable The refrigerator is a 120 volt AC, 60 Hz appliance. The and dishwasher safe.

  • Page 13: Interface Module

    model Watts ohms amps NDA 1402 34.3 NDE 1402 34.3 The NDA/NDE1402 models use two AC heaters wired in series. The resistance should be 34.3 Ohms +/- 10%. The tabs on the module are from left to right: • (4) Interconnected tabs that serve as intercon- nection points of four neutral wires (white).

  • Page 14: Ac Sensing

    DC power. The converter and alternator pro- duce DC power by a series of diodes that rectify alternat- ing current to DC. The Dometic control system will only tolerate up to 6 volts AC on the DC line (Also known as AC ripple).

  • Page 15: Temperature Sensors

    5.2 temperature Sensors Fresh food air thermistor: Remove the P3 connector from the lower control The NDA/NDE 1402 has two sets of thermistors. One board. Check the resistance between pins 1 and 2 on for the freezer and the other for fresh food compartment. the P3 connector.

  • Page 16: Interior Fans

    5.5 Interior fans 5.6 thermo fuse Both compartments have fans to help distribute the tem- The NDA/NDE 1402 cooling unit has a thermo fuse lo- perature evenly throughout the unit. These fans are DC cated on the boiler. The function of the thermo fuse is to operated and are connected directly to the lower power shut down the control system in the event of a cooling module.

  • Page 17: Ignition Control Module

    The ignition control module has an additional ground strip wire underneath the left mounting tag. This wire must be in good contact with the metal frame of the burner as- this is an energized circuit. Shock can occur sembly before the system is energized. Otherwise both if not tested properly.

  • Page 18: High Voltage Cable

    5.11 Solenoid Depressions of the AUTO/STORE and SET buttons are interpreted by means of the display board processor, which then sends commands via a serial data bus down Check the solenoid coil with a properly calibrated Ohm to the power module. The power module processor then meter.
  • Page 19 tyPIcal WIrIng dIagram nda 1402...
  • Page 20 tyPIcal WIrIng dIagram nda 1402...

  • Page 21: Lower Board

    (F4) 7.5 amp note: All current Dometic control boards are 3 try sys- (F5) 5 amp tems in the gas mode. There is a 2 minute purge cycle between each trial for ignition. Flame failure could take 6 Always refer to the wiring diagram for the model/product to 7 minutes.

  • Page 22: Lp Gas

    7.2 Orifice sembly. Use a calibrated manometer to check for proper gas pressure. The Dometic orifice is a brass alloy with a man-made ruby pressed in the center that has been laser-beam drilled in SectIon 7 a spiral pattern. The orifice is cleaned by using an alco- hol based solvent.

  • Page 23: Burner

    To clean the burner, remove from the refrigerator using a flue brush, Dometic Part Number 0151404001. If and check for any foreign residue that could cause a de- the flue tube becomes coated with scale or residue from flection of the gas flow or the flame.

  • Page 25: Ventilation

    8.2 Ventilation typical roof Vent and Side Wall Vent The installation shall be made in such a manner as to separate the combustion system from the living space of the mobile home or recreational vehicle. Openings for air supply or for venting of combustion products shall have a minimum dimension of not less than 1/4 inch.
  • Page 26 typical two Side Wall Vent application. always refer to Vent Instructions 3308666.xxx (Dimensions are in inches) Model Min. Min Dim. Min Dim. Min Dim. Vent +1/4, -0 Dim. Dim. Height NDA 1402 27 - 1/16 5 - 1/8 4 - 5/8 44 - 1/2 NDE 1402 27 - 1/16...

  • Page 27: Ventilator Fans

    8.3 Ventilator fans 8.5 food Storage The NDA/NDE 1402 models use two ventilator fans Proper refrigeration requires free air circulation within mounted to the back of the refrigerator (exterior). The pur- the food storage compartments. Restricted air circula- pose is to assist required air movement across the refrig- tion within the compartments will cause higher cabinet erator condenser to ensure optimum performance.

  • Page 28: Interior Liner Seal To Frame

    For refrigerators lacking this strip, contact Dometic Tech- nical Services and ask for part# 385133501. ( r e f r i g e r a t o r...

  • Page 29: Drain Tube

    707XXXXX may require an auxiliary defrost fan kit to be installed to reduce the formation of frost in the freezer sec- tion. Contact Dometic Technical Service at 800-216-5115 to order an auxiliary defrost fan kit (Part# 385130901). The Refrigerator must be completely defrosted before re- pairs are completed to ensure proper operation.

  • Page 30: Real Time Clock

    SectIon 10 Heating in the freezer defroStIng After the relaxing period, the heating elements in the 10.1 real time clock freezer and in the water drain are switched “ON”. The fan in the freezer is at the same time stopped to pre- To get the best performance from the refrigerator, defrost- vent the food from being heated by hot air.

  • Page 31: Manual Defrosting

    freezer fan operation during and after a de- 10.4 drying function frosting When the NDA/NDE 1402 refrigerator is to be off for some time, the compartments must have a chance to dry up to The fan in the freezer is stopped during defrosting prevent mold from forming.

  • Page 32: Fresh Food Defrost Heating Element

    10.6 fresh food defrost Heating element The fresh food heater is located behind the cooling fins along the back wall of the refrigerator section. When ac- tivated, it will provide 40 watts of heat to melt any ice or frost that may have accumulated during normal operation. To check the resistance of the heater, remove the cover from the main control board on the back of the refrig- erator.

  • Page 33: Status Messages

    SectIon 11 trouBle SHootIng 11.1 Status messages • Only one error code is displayed at a time. If more than one error exists, the error with the lowest error number is shown. • Some errors are only detected at the power ON self-test; others are detected all the time and will be shown as soon as they occur.

  • Page 34: Error Codes

    11.2 error codes NDA1402 NEA1402 Error codes are shown flashing, alternated with the message “CALL”. fault detected message displayed Defrost heater for the freezer plate is faulty. “Er 11” Defrost heater for the fresh food cooling flange is faulty. “Er 12”...
  • Page 35 “Er 15”: “Er 19”: The fault is detected as an “open circuit” to the fan in the The fault is detected as an “open circuit” to the surface fresh food compartment. temperature sensor in the fresh food compartment. Possible faults: Possible faults: •...

  • Page 36: Service Mode

    “On” = turned on, “-- --” = fault detected or “bl” = fan is blocked. “i9” = sparking, “FL” = flame is present, “-- --” = fault detected. Turn on gas ignition system (NDA1402) only. test 03: air temperature Sensor test...
  • Page 37 test 04: test 08: test of the defrost Heating element in the Surface temperature Sensor test freezer The display shows the actual temperatures in degrees A disconnected or broken defrosting element in the Fahrenheit on the cooling surfaces, freezer to the left freezer results in the display “--”.

  • Page 38: Ice Maker

    The refrigerator has to be con- nected to 120 volts AC before the ice maker can operate. The water line manual shutoff valve (not part of Dometic unit) must be open. To start making ice, move the ice level 12.3 Ice ejector...

  • Page 39: Mold Thermostat

    12.4 mold thermostat This is a single-pole, single-throw, bimetal switch. It starts an ejection cycle by closing at 15º F ± 5º F. The reset tem- perature is 50º F ± 5º F. The thermostat is in series with the mold heater and acts as a safety against overheating in case of a mechanical failure.

  • Page 40: Ice Maker Replacement

    12.10 Water fill adjustment (SIngle) The correct water level in the mold is important for the proper production of ice. The size of the ice cubes de- pends on the amount of water which enters the mold. The cubes should be approximately 1/2” wide, 3/4” high and 2-1/2”...

  • Page 41: Water Supply

    • 12.12 Water Supply The insert needs to be partially (not fully) insert- ed into the clear tubing. To operate properly, the water pressure in the water sup- ply line must be greater than 15 lbs. psi. Lower water pres- sure, water turned off, or obstructions or air in the water line can cause low or no ice production.

  • Page 42: Wiring

    12.13 Wiring note tHe relatIVe PoSItIon of tHeSe comPonentS In tHe folloWIng ScHematIcS this is an energized circuit. Shock can occur if not tested properly. testing is to be done by a qualified service technician. Water Valve (Single) Refer to the wiring diagram supplied with the unit you are working on, and make sure all wiring connections are correct and tight.
  • Page 43 after a few degrees of motor rota- tion, the timing cam switches the Near the completion of the first rev- holding switch to its normally open olution, the timing cam closes the position; this assures completion of water valve switch. However since the cycle.
  • Page 44 near the completion of the second revolution the timing cam again once again after a few degrees of closes the water valve switch. this rotation the timing cam closes the time a circuit is completed through holding switch providing a circuit to the water valve solenoid, its switch the motor that will assure completion and mold heater.

  • Page 46: Door Dispenser

    SectIon 13 dISPenSer lIgHt The light can be turned on and off by pressing the “Light” door dISPenSer touch pad. The light will illuminate the dispenser area. The light will also turn on automatically when ice or water 13.1 operation is dispensed.

  • Page 47: Solenoid

    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 this is an energized circuit. Shock can occur tight seal.

  • Page 48: Water Dispenser

    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.

  • Page 49: Thermistors

    SectIon 15 mIScellaneouS 15.1 thermistor Thermistor values at varying temperatures: See section 5.2, page 15 for procedure to test thermis- tors. temperature f° temperature c° ohms 2343 2601 2917 3275 3684 4152 4687 5300 5952 6755 7682 8754 9995 11435 13111 15064...
  • Page 50 This manual has been provided courtesy of My RV Works, Inc. www.myrvworks.com You can find more RV service manuals here: www.myrvworks.com/manuals Over the years of running a mobile RV repair service, having a dedicated place to access service manuals for all the different appliances and components found on RVs was something that I always had a desire to create.

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