Mitsubishi Electric MJ-E14CG-S1-IT Service Manual page 13

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C
The unit stop working in the
middle of operation.
NO
Stepping motor (louvre)
does not operate.
NO
E
D
Does the solenoid valve operate?
(Shorten J301 and J302)
YES
Are there any clogs or dust on
the filter.
NO
Is the operating environment
low humidity and low temperature?
NO
The unit is normal.
Is the defrost mode selected?
YES
Does the defrost indicator light?
NO
Is automatic operation
selected?
Easy dehumidifying /
Intelligent laundry /
Mildew guard / Auto / Off timer
NO
1) Easy dehumidifying:It stops according to the humidity level.
2) Intelligent laundry:It stops in a minimum of about 60 minutes and a maximum of about
12 hours.
3) Mildew guard:It operates intermittently 2-4 hours (24 hours).The operating time varies
depending on the humidity.
4) Auto:Compressor and blower fan stop when current humidity is -1% of set humidity or less.
5) Off timer:It stops at the set time.
6) All operation mode:Is the off timer operation selected with other operation mode?
Off timer operation has priority over other modes.
1-6 indicate that the unit is operating normally. Explain that to the customer.
YES
Is the swing louvre switch
"OFF"?
NO
Check if there is no disconnection or
contact failure of the connector ( P20 ) and
connector pins of power control board.
OK
Check the resistance between
connector pins of the stepping
motor (P20 connector).
Normal:
Terminal1-2
Terminal1-3
342-418
Terminal1-4
Terminal1-5
Abnormal:Each interval is
open or short
OK
Check if there is no disconnection
NO
or contact failure of the connector
( P3 ) and connector pins of power
control board.
OK
Check the resistance of the
solenoid valve coil.(P3 connector)
Nornal:Between the pin1 and
pin2 2.0k -2.2k
Abnormal:Open or short
OK
YES
Clean filter.
NG
YES
It is normal.
Dehumidication may not be
possible in low humidity and
low temperature environments.
Explain the performance
curve on P9.
It is normal.
YES
Defrost mode is operating.
Airflow stops in a few minutes.
Is the operating
YES
environment low humidity
and low temperature?
Does the swing direction of
YES
the louvre change to "Wide",
"Upward",or "Rear"?
NO
Insert the connector and
NG
connector pins securely.
OK
NG
Replace the stepping motor.
OK
Insert the connector
NG
and connector pins
securely.
NG
NG
Replace the solenoid valve coil.
NG
Replace the power control board.
NG
Replace the operation control board.
OK
OK
OK
Dehumidication may
YES
not be possible in low
humidity and low
temperature environments.
Explain the performance
curve on P9.
YES
The unit is normal.
NG
Replace the power control board.
NG
Replace the operation control board.
OK
OK
OK
OK
13

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