Troubleshooting Procedure - Mitsubishi Electric MJ-E14CG-S1-IT Service Manual

9. Troubleshooting procedure

1) Failure diagnosis flowchart
Are error codes
displayed?
"E0" "E1" "E7" "E8"
"A1" "A2" "A3" "A6" "P4"
NO
Does the power lamp light
by turning the power on?
YES
Does the detective buzzer beep
by turning the power on?
YES
Is "Full lamp" lighting?
NO
Does it dehumidify?
YES
A
Refer to "Error Indications and
YES
CorrectiveActions," and follow
the procedures.
NO
Check the continuity of power cord.
OK
Check the current fuse of
power control board ( 2A/250V ) .
OK
NO
Check if the lamps and LCD
of control panel light.
How to put out all lighting ( Press
*
the mode switch and the humidity
selection switch together 4 times
when the power is off. Turn on
the power within 2 seconds.)
Check if LED on the operation
*
control board is down.
(When LED is down, correct it.)
OK
YES
Is the tank filled with water ?
NO
Check the float.
or attached upside-down?
Is the float movement smooth?
Is a magnet attached to the float?
OK
Check the float switch.
Check if there is no disconnection or
contact failure of the connector ( P13 ) and
connector pins of power control board.
Check the continuity between connecter ( P13 )
terminals when the water tank is equipped.
Normal ... Tank full:open
Empty:short
OK
NO
Does the blower fan motor rotate?
YES
B
NG
Replace the power cord.
NG
Replace the power control board.
NG
Check if there is no
disconnection or contact
failure of the connectors
and connector pins of
powercontrol board.
YES
Drain water from the tank.
NG
NG
Check the float.
NG
NG
Replace the float switch.
NO
Check if there is no disconnection
or contact failure of the connector
( P2 ) and connector pins of power
control board.
OK
Check the resistance of the
blower fan motor.
Normal:Between yel
Abnormal: Open or short
OK
Replace the power control board.
NG
Replace the operation control board.
OK
OK
OK
NG
Insert the connector
and connector pins
securely.
NG
Replace the operation control board.
NG
Replace the power control board.
OK
NG
Replace the power control board.
NG
Replace the operation control board.
OK
NG
Insert the connector
and connector pins
securely.
NG
NG
Replace the blower fan motor.
NG
OK
OK
OK
OK
OK
OK
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