Mitsubishi MJ-EZ6CX-S1-IT Service Manual page 20

The unit is normal.
Only a small quantity of
water is dehumidified.
NO
20
Check if there is no disconnection
or contact failure of the connector
( P3 ) and connector pins of the
power control board.
OK
Check the resistance of the frame fuse.
Normal : short
Abnormal : open
OK
Check if there is no disconnection
or contact failure of the connector
( P11 ) and connector pins of the
operation control board.
OK
Check the resistance of the frame
thermistor.
Normal : 180k -500k
Ω Ω
Abnormal : open or short
OK
NO
Does it dehumidify?
YES
YES Is the dehumidifier used in the
low-humidit y / t emperature
environment ?
NO
Is Auto operation selected?
( Dehumidifying ( Auto ) / Intelligent laundry
/ Deo-dry / bathroom mildew guard
/ OFF timer )
NO
1 ) Dehumidifying ( Auto ) : Blower fan stops when temperature is 27
or less, and current humidity is –1% of set humidity or less.
2 ) Intelligent laundry : It stops in a minimum of about 84 minutes and a maximum of about 12 hours.
3 ) Deo-dry : It stops in about an hour.
4 ) Bathroom mildew guard : A minimum of about 4 hours and a maximum of about 12 hours.
5 ) OFF timer : Is the timer operation selected ? It stops at the set time.
6 ) All operation modes : Is the timer operation selected with other operation mode ?
Timer operation has priority over other modes, so it stops at the set time.
1-6 indicate that the unit is operating normally. Explain that to the customer.
OK
Are there any clogs or dust on
the filter?
NO
Is there any dust on the room
temperature / humidity sensor?
NO
Check if there is no disconnection or
contact failure of the connector ( P9 ) and
connector pins of power control board.
OK
NG
Insert the connector and
connector pin securely.
OK
NG
Replace the frame fuse.
NG
Insert the connector and
connector pin securely.
OK
NG
Replace the frame thermistor.
Dehumidifying cannot be performed
YES
or only a small amount of water is
dehumidified under the condition of
low humidity and low temperature.
OK
Change the operation mode
YES
to dehumidifying ( High ) .
Does it work?
YES
YES
Clean filter.
OK
YES
Remove the dust from the room
temperature / humidity sensor.
OK
NG
Insert the connector and connector
pin securely.
OK
NG OK
Replace the power control board.
NG
OK
Replace the operation control board.
NG
OK
Replace the operation control board.
NG
OK
Replace the power control board.
It is normal.
NG
The unit can operate in a room
temperature range of 1-35 .
℃
① When the room temperature is
less than1 , dehumidified water
℃
freezes and it hinders dehumidifying.
OK
② When the room temperature is
more than 35 , internal temperature
℃
of the unit rises, which activates the
protective device.
①② The unit operates in blower
mode without dehumidifying. Explain
that to the customer.
℃