Mitsubishi Electric MJ-E14EG-S1-IT, Service Manual

Page: 10 / 39

10
9. Troubleshooting procedure
1) Failure diagnosis fl owchart
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
fi rmly 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
fl oat switch disconnected
or installed reversely?
• Is the fl oat operation smooth?
• Is there a magnet attached
to the fl oat?
Repair the fl oat problem
Check the fl oat 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 fl oat 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
NG NO
OK
OK
NG
NG
NG
OK
NG
NG OK
OK
OK
OK
YES
YES
NO
NO
YES
YES
NO