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Troubleshooting

   Summary of Contents for Mitsubishi Electric MJ-E14EG-S1-IT

  • Page 1: Table Of Contents

    2013 DEHUMIDIFIER SERVICE MANUAL No.MJW-E-13020 MJ-E14EG-S1-IT Model Sold from 2014 CONTENTS Precautions Names and Functions of Parts Specifications Outer Dimensions Wiring Diagram Function Technical Points Precautions for failure diagnosis Troubleshooting Procedure 10. Troubleshooting 11. Maintenance 12. Service Checklist 13. Precautions for Disassembly and Reassembly 14.

  • Page 2: Precautions

    1. Precautions Note) This page is extracted from the instruction manual.

  • Page 3

    Note) This page is extracted from the instruction manual.

  • Page 4: Names And Functions Of Parts

    2. Names and Functions of Parts Note) This page is extracted from the instruction manual.

  • Page 5: Specifications

    Note) This page is extracted from the instruction manual. 3. Specifi cations 4. Outer Dimensions...

  • Page 6: Wiring Diagram

    5. Wiring Diagram 1) Wiring Diagram Thermopile Capacitor for Com- Float switch (Move Eye) compressor Solenoid pressor Room Valve temperature Ambient Object tempera- tempera- sensor ture ture Humidity sensor HUM.S Yellow/Green Brown Power supply board Control board Blue Power plug Stepping Stepping motor...

  • Page 7: Function

    6. Function Function List  Operating mode Blower fan ON/OFF OFF ON/OFF OFF Compressor ON/OFF OFF Up-down louvre CLOSE *1*3 *1*4 CLOSE CLOSE centre Left-right louvre Centre *2*3 *2*4 OFF Centre Centre Centre POWER Flashing FULL DRYING INSIDE 7-segment Current humidity display (3-second display of set humidity only when SELECTION is selected) Operation mode Selected operating mode lamp lit Flashing...

  • Page 8: Technical Points

    Note) This page is extracted from the instruction manual. 7. Technical Points...

  • Page 9: Precautions For Failure Diagnosis

    8. Precautions for failure diagnosis The following precautions should be observed in order to perform troubleshooting safely and correctly. The following diagrams indicate circumstances where danger can result from mishandling the unit. WARNING Mishandling may result in fatal or serious injury, or fi re. Mishandling may result in injuries or damage to your home or property, etc.

  • Page 10: Troubleshooting Procedure

    9. Troubleshooting procedure 1) Failure diagnosis fl owchart Do any of the following Perform the recommended errors appear on the humidity indicator? actions described in “Error “E0” “E1” “E2” “E3” “E4” Indications and Corrective “E5” “E7” “E8” “A1” “A2” Actions” on page 16. “A6”...

  • Page 11

    Is dehumidifi cation Check the power supply Firmly insert the Is the blower fan motor rotating? taking place? board P7 connector insertion connectors or and the connector pins connector pins Replace the power Check the resistance values supply board for the blower fan motor. Normal:Between yellow and blue 217-236Ω...

  • Page 12

    Check the resistance values Replace the tube for the tube temperature. temperature thermistor Normal: 8.0KΩ to 20.8KΩ (Between P15 pins) Abnormal: Open or shorted Replace the control board Replace the power supply board Check the resistance values Replace the solenoid valve for the solenoid valve.

  • Page 13

    Is the left-right swing louvre Does the left-right swing Normal stopped? change to Wide and Stop swing operation? Check the connection Firmly insert the between the control board connectors or connector P9 connector and the pins in the trouble spots stepping motor as well as the connector pins.

  • Page 14

    Amount of Is the dehumidifi er installed The unit is normal. in a low humidity, low Dehumidifi cation may dehumidifi cation is low temperature environment? not be possible in a low humidity and low temperature environment. Explain the performance curve on page 8. Is there dust or dirt on the Remove the dust or room temperature sensor?

  • Page 15

    2) Simple Check Table for Main Parts Part name Test criteria Disconnect the connector and measure the resistance values with a tester (Part temperature 10°C to 30°C). Tube temperature detection thermistor Normal Abnormal 8.0KΩ to 20.8KΩ Open or shorted Disconnect the connector and measure the resistance values with a tester (Part temperature 10°C to 30°C).

  • Page 16

    3) Error Indications and Corrective Actions Indicator (current humidity Error (failure) Corrective action display) Microprocessor failure Replace the control board RAM error Check the outlet, 220V power Frequency determination error (Try to replace the power supply and control boards) Watchdog error Replace the control board (Main stop/Interrupt) Replace the control board...

  • Page 17

    (2) LED and Monitor indicators Start ..Press the MOVE EYE and DEHUMIDIFY switches together 4 times when  the power is off. Press the POWER switch within 2 seconds. Mode selection ..Use the TIMER switch to change the diagnostic mode (0 to 13). The selected ...

  • Page 18: Troubleshooting

    Note) This page is extracted from the instruction manual. 10. Troubleshooting...

  • Page 19

    Note) This page is extracted from the instruction manual.

  • Page 20: Maintenance

    11. Maintenance Note) This page is extracted from the instruction manual.

  • Page 21: Service Checklist

    12. Service Checklist (1) Points to be checked after completing repairing After completing repairing, check the all items below to prevent re-repair. Check items Check Was the proper tool used? Are the parts on the parts catalog used? Verify that there is no problem in the lead wire (layout and connection) and/or clamp. Verify that there is no defect, such as lead wire caught in other parts, damage, and/or intermediate connection.

  • Page 22: Precautions For Disassembly And Reassembly

    13. Precations for Disassembly and Reassembly The following precautions should be observed in order to perform disassembly and reassembly safely and correctly. The following diagrams indicate circumstances where danger can result from mishandling the unit. Mishandling may result in fatal or serious injury, or fi re. WARNING Mishandling may result in injuries or damage to your home or property, etc.

  • Page 23

    CAUTION Wear protective gloves. Keep children away. Wear gloves Keep away Failure to do so may result in injuries Failure to do so may result in by the edge of metal, electric shock, electric shock and/or injuries when moving and/or burns caused by contact with hot section. the unit or using a measuring device.

  • Page 24: Disassembly And Reassembly Hints

    14. Disassembly and Reassembly Hints [Precautions for Assembly] • Firmly connect the lead wire connectors. Firmly tighten the screw connectors in particular. • If the binding band holding the lead wires is cut, it must be replaced with a new binding band. •...

  • Page 25

    (3) Removing the front casing Remove the water tank. → (See (1) Removing the water tank) Remove the rear casing assembly. → (See (2) Removing the fi lter cover and rear casing assembly) Remove the front casing set screw (1) from the side of the main unit. Front casing set Release the catch on the bottom of screw (1)

  • Page 26

    (5) Removing and replacing the control board Remove the front and rear casings. Control board → (See (2) Removing the fi lter cover and Slide Slide rear casing assembly, and (3) Removing the front casing) Disconnect all of the connectors (P9, P11, P12, P15, P20, P21, P40, and P50) from the control board, and gently lift and slide the control board out.

  • Page 27

    (7) Removing and replacing the blower net and the blower motor Remove the board holder from the board Remove connector P7 assembly. → (See (6) Removing and replacing the power supply board) Remove the net. Power supply board Disconnect the P7 connector from the power supply board.

  • Page 28

    (9) Removing and replacing the solenoid valve Remove the board holder from the power Remove connector P6 supply board assembly. → (See (6) Removing and replacing the power supply board) Disconnect connector P6 from the power Power supply board supply board. Solenoid valve Remove the solenoid valve set screw(1) to remove the solenoid valve.

  • Page 29

    (11) Removing and replacing the drain pan assembly Remove the blower fan assembly. → (See (7) Removing and replacing the blower net and the blower motor) Release the drain pan catches (4) from the base, and remove the drain pan assembly while holding the heat exchange assembly away from the main unit.

  • Page 30

    (13) Removing and replacing the louvre assembly Gear holder Remove the front casing. → (See (3) Removing the front casing) Remove the operation control board from the louvre assembly. → (Removing and replacing the operation control board) Top cover set screws(2) Remove the top cover set screws (2) from the louvre assembly, and remove the top Gear...

  • Page 31

    Louvre/gear assembly procedure  Raise the louvre assembly so that the gear does not drop. Line up the Place each of the louvres CY-1, CY-2, and CY-3 Upward protrusions position in the upward position, and line up the protrusions on louvres with the markings on the top casing.

  • Page 32

    Operation Checks When the side of the move sensor assembly is held and rotated left and right about 60 degrees (a total of 120 degrees), the fan must move Left and right 60° smoothly in sync. When louvre N is held and rotated by hand, it must operate smoothly with no unusual noises.

  • Page 34: Parts Catalog

    15. Parts Catalog MJ-E14EG-S1-IT Model Structural Disassembly Diagram [ Casing and Tank Structure ] SCW-PL-TBFZR 4×12(3) SCW-PL-TBFZR 4×12(1) SCW-TPFZR 3×8N(3) SCW-PL-TBFZR SCW-DPFZR-PT 4×12(2) 3×10(1) SCW-PL-TBFZR 4×12(2) TBFZR 3×10M(2) SCW-TBFZR SCW-DPFZR-PT(White) 3×10M(1) 3×10(1) SCW-MPFZR M4×14-TORX(2) SCW-PL-TBFZR 4×12(6) SCW-PL-TBFZR 4×12(1)

  • Page 35

    Model MJ-E14EG-S1-IT Model Parts List [ Casing and Tank Structure ] Notes: 1. Circled reference numbers indicate performance parts. 2. New parts and the parts that are used only with these models lack compatibility. 3. Those parts that are marked by are of critical importance for sustaining safety and performance.

  • Page 36

    MJ-E14EG-S1-IT Model Structural Disassembly Diagram [ Blower Fan Parts ] SCW-PL-TBFZR 4×12(4) SCW-PL-TBFZR 4×12(2) NUT-LFZR M6(1) Filament tapes (width:19) *After removing the filament tapes, be sure to attach new ones. SCW-TPFZR 4×8M SCW-PL-TBFZR 4×12(1)

  • Page 37

    Model MJ-E14EG-S1-IT Model Parts List [ Blower Fan Part ] Notes: 1. Circled reference numbers indicate performance parts. 2. New parts and the parts that are used only with these models lack compatibility. 3. Those parts that are marked by are of critical importance for sustaining safety and performance.

  • Page 38

    MJ-E14EG-S1-IT Model Structural Disassembly Diagram [ Heat Exchanger and Compressor Parts ] 313 : tube temperature thermistor attached part Figure B SCW- BPBN M4×6(1) SCW-DPFZ-SPL 4×12 1 SCW-DPFZ-SPL 4×12(1) SCW-TPFZR 5×35M(3) SPL-WASHER-R(3) Figure A...

  • Page 39

    Model MJ-E14EG-S1-IT Model Parts List [ Heat Exchanger and Compressor Part ] Notes: 1. Circled reference numbers indicate performance parts. 2. New parts and the parts that are used only with these models lack compatibility. 3. Those parts that are marked by are of critical importance for sustaining safety and performance.

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