Mitsubishi Electric MJ-E14EG-S1-IT User manual

2013
DEHUMIDIFIER
SERVICE MANUAL
Model MJ-E14EG-S1-IT
No.MJW-E-13020
Sold from 2014
CONTENTS
1. Precautions 2
2. Names and Functions of Parts 4
3. Specifications 5
4. Outer Dimensions 5
5. Wiring Diagram 6
6. Function 7
7. Technical Points 8
8. Precautions for failure diagnosis 9
9. Troubleshooting Procedure 10
10. Troubleshooting 18
11. Maintenance 20
12. Service Checklist 21
13. Precautions for Disassembly and Reassembly 22
14. Disassembly and Reassembly Hints 24
15. Parts Catalog 34

2
1. Precautions
2
Note) This page is extracted from the instruction manual.

33
Note) This page is extracted from the instruction manual.

4
2. Names and Functions of Parts Note) This page is extracted from the instruction manual.

5
3. Specifications
4. Outer Dimensions
Note) This page is extracted from the instruction manual.
238
160 80 210
360
534

6
P1
P3 P6 P12P13
HUM.S
P9 P11 P20 P21
P100 P101
P7
P30 P50
P15
VDD GND
P40
P2
CRS
Operation control
board
Control boardPower supply board
5. Wiring Diagram
1) Wiring Diagram
2) Board Diagram
[Operation control board]
[Power supply board]
[Control board]
Com-
pressor
Capacitor for
compressor Fan Solenoid
Valve
White
Red
Gray Gray
Black
Yellow
Blue Blue
Yellow/Green
Blue
Brown
Power plug
Humidity
sensor
Room
temperature
sensor
Thermopile
(Move Eye)
Ambient
tempera-
ture
Object
tempera-
ture
Float switch
Gray
Blue
White White White
Gray
Tube
temperature
thermistor
Stepping
motor
(left/right)
Stepping
motor
(up/down)

7
6. Function
Function List
Operation Off
Operating mode
Laundry Mildew guard Low High Auto Defrosting detection Tank full detection (Dehumidify) Tank full detection (Move Eye) Tank full protection Drying inside ON timer setup in progress ON timer setup complete
Blower fan OFF ON ON ON ON ON/OFF ON ON ON OFF ON/OFF OFF OFF
Compressor OFF ON ON ON ON
ON/OFF OFF OFF OFF OFF OFF OFF OFF
Up-down louvre CLOSE ON ON *1 *1 *1*3 *1*4 *1 ON OFF Top
centre
CLOSE CLOSE
Left-right louvre Centre ON ON *2 *2 *2*3 *2*4 *2 ON OFF Centre Centre Centre
LED indicator
POWER Flashing
FULL
DRYING INSIDE
LCD indicator
7-segment Current humidity display (3-second display of set humidity only when SELECTION is selected)
Operation mode Selected operating mode lamp lit Flashing Lit
MOVE EYE *4 *4 *4
TIMER Set OFF timer time display ON timer time display
Up-down swing area *1 *1, *5 *1 *1 *1
Up-down swing monitor *1
Left-right swing area *2 *2, *5 *2 *2 *2
Left-right swing monitor *2
CHILD LOOK Lit when child lock is ON
Switch
POWER
MOVE EYE *6 *6
DEHUMIDIFY *6 *6
SWING *5 *5 *5
SWING *5 *5 *5
DRYING INSIDE
TIMER *7
CHILD LOCK
*1: Operates when ON is selected for the up-down louvre. Stops when OFF is selected.
*2: Operates when ON is selected for the left-right louvre. Stops when OFF is selected.
*3: Operates when the blower fan is running
*4: Can only operate when using MOVE EYE (LAUNDRY, MILDEW GUARD) mode.
*5: Can only operate when using DEHUMIDIFY (LOW, HIGH, AUTO) mode.
*6: Operation mode moves to “tank full protection” when the switch is pressed.
*7: Can operate as the ON timer setting
: Lit/Can operate
: Unlit/Stopped/Cannot operate
When MOVE EYE is to be turned OFF (MOVE EYE operating mode only)
If MOVE EYE is to be turned OFF when it is in MOVE EYE operating mode, turn the power OFF and press
the MOVE EYE switch for at least 3 seconds.
Follow the same procedure to turn operations ON.
MOVE EYE is ON at the time of factory shipment.
This dehumidifier remembers whether MOVE EYE is ON or OFF.
Even if the power plug is pulled out or power is turned OFF, operations start with the same setting that
was previously set.

8
7. Technical Points Note) This page is extracted from the instruction manual.

9
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 fire.
CAUTION
Mishandling may result in injuries or damage to your home or property, etc.
Forbidden Always follow the
instructions Alert
Meanings of graphic symbols are explained below.
Remove the power plug
from the socket.
Failure to do so may cause electric shock or injuries.
When performing work with
the power on, be careful not
to touch the live part.
This may cause electric shock.
Do not touch a rotating object
until it completely stops.
The rotating object may catch your hand etc,
and result in injuries.
Do not work with wet hands.
This may cause electric shock.
Check the wiring diagram
before wiring processing.
Failure to do so may cause combustion,
generation of smoke, and/or malfunction.
After the work,
lay the wire out as it was before.
Failure to do so may cause combustion,
generation of smoke, and/or malfunction.
Unplug Electric shock
Don't touch No wet hands
Check Return to
as it was
WARNING
Wear protective gloves.
Failure to do so may result in injuries
by the edge of metal, electric shock,
and/or burns caused by contact with hot section.
Keep children away.
Failure to do so may result in
electric shock and/or injuries when moving
the unit or using a measuring device.
Wear gloves Keep away
CAUTION

10
9. Troubleshooting procedure
1) Failure diagnosis flowchart
Do any of the following
errors appear on the
humidity indicator?
“E0” “E1” “E2” “E3” “E4”
“E5” “E7” “E8” “A1” “A2”
“A6” “A8” “P4”
Perform the recommended
actions described in “Error
Indications and Corrective
Actions” on page 16.
Check the continuity of current
fuse on the power supply board
FUSE1 : 10A FUSE2/3 : 2A
CHILD LOCK indicator
turns on
When the POWER switch is
turned ON, does the operating
mode lamp turn on?
Deactivate the child lock
Check the power cord conduction Replace the power cord
Replace the power
supply board
Does the detection buzzer
beep when the POWER
switch is turned ON?
Check if the lamps on the
control panel turn on.
* How to turn on all of the
lamps (See “LED and
Monitor indicators” on
page 17)
* Check whether any of the
LEDs on the operation
control board have fallen
off (repair if an LED has
fallen off)
Check that the power
supply board, control
board and operation
control board connectors
are firmly connected
(carefully check whether
any of the connector pins
have been pulled out,
etc.).
Firmly insert the
connectors or
connector pins in
the trouble spots
Replace the operation
control board
Replace the control
board
Replace the power
supply board
Is the FULL lamp lit? Is the tank full?
Drain the water from the tank
Float check:
• Is the float switch disconnected
or installed reversely?
• Is the float operation smooth?
• Is there a magnet attached
to the float?
Repair the float problem
Check the float switch
• Check the control board
P12 connector insertion
and the connector pins
• Check the continuity
between the P12
connector terminals when
the water tank is installed
Normal . . . When tank is
full: shorted
When tank is empty: open
Replace the float switch
Replace the control board
Replace the power
supply board
A
YES
YES
NO
NO
YES YES OK
NG
NG
OK
OK
OK
NG NG
NG
NG
NG
OK
OK
NGNO
OK
OK
NG
NG
NG
OK
NG
NG OK
OK
OK
OK
YES
YES
NO
NO
YES
YES
NO