Mitsubishi Electric MJ-E14EG-S1-IT Service Manual page 12

B
The unit stops working
in the middle of operation
The louvre does not
swing
D
12
Check the resistance values
for the tube temperature.
Normal:
Abnormal: Open or shorted
Check the resistance values
for the solenoid valve.
Normal:
Abnormal: Open or shorted
Is the fi lter blocked due to dust, etc.?
Is the operating environment low
humidity or low temperature?
The main unit is operating
normally.
Check the operating environment
again, and then operate again.
YES
Is the operation being
performed with the unit set to
automatic operating mode?
NO
(LAUNDRY/MILDEW
GUARD/AUTO/OFF TIMER)
LAUNDRY: A minimum of about 84 minutes to a maximum of about 12 hours
MILDEW GUARD: A minimum of about 4 hours to a maximum of about 12 hours
AUTO: If the current humidity goes lower than the set humidity, operation stops.
OFF TIMER: Has the timer stopped operating? Operation stops at the set time.
Is the OFF timer being used at the same time as timer OFF for all operating modes?
Operation stops at the set time as timer operation is given priority.
The main unit is operating normally if
Is the up-down swing louvre
YES
OFF?
NO
Check the connector connection
between the control board P11
connection and the stepping motor
connector and connector pins.
Check the resistance values
between the stepping motor
connector pins.
Normal
Terminals 1-2
Terminals 1-3
Terminals 1-4
Terminals 1-5
Abnormal
Open or shorted
E
C
NG
Replace the tube
temperature thermistor
8.0KΩ to 20.8KΩ
(Between P15 pins)
Replace the control board
OK
Replace the power supply board
NG
Replace the solenoid valve
2.0KΩ to 2.2KΩ
(Between the pin1 and pin2)
Replace the control board
OK
Replace the power supply board
YES
NO
YES
Normal. Dehumidifi cation
may not be possible in low
humidity and low temperature
NO
environments.
Explain the performance curve
on page 8.
Is the dehumidifi er installed
YES
in a low humidity, low
temperature environment?
NO
Does the up-down swing
YES
louvre change to Wide,
Frontward, and Upward?
NO
Firmly insert the
connectors or connector
NG
pins in the trouble spots
OK
NG
Replace the stepping motor
342Ω to 418Ω
OK
OK
NG
NG
OK
NG
NG
OK
OK
Clean fi lter
NG
OK
YES
through are true.
YES
NO
OK
NG
OK
Dehumidifi cation
may not be possible
in a low humidity,
low temperature
environment. Explain
the performance
curve on page 8.
Normal
OK
Replace the control
board
NG
OK
Replace the power
supply board