Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 59

Error code
Remote controller:
WAIT
7-segment display:
1. Applicable model
All models
(In case that is kept
WAIT
on displaying on the remote
controller for more than 2
minutes after power ON)
2. Error detection method
3. Condition of error displayed
4. Presumable cause
• Fuse blown
• Noise filter anomaly
• Anomalous connection of
wire between PCBs
• Indoor control PCB anomaly
• Remote controller anomaly
• Breakage of connecting wires
of remote controller
• Outdoor control PCB anomaly
Note:
(1) When anomaly occurs during establishing communication betweeen indoor and outdoor unit, error code E5 is displayed (outdoor red LED
flash 2-times)
In case of E5, the way of troubleshooting is same as above mentioned (except for checking of connecting wire)
When reset the power after E5 occurs, if this anomaly recurs,
in a short period (within 1 minute),
(2) If any error is detected 30 minutes after displaying "
LED Green Red
Indoor Keeps flashing Stays Off
Outdoor
Keeps flashing Keeps flashing
5. Troubleshooting
Diagnosis
is kept on
WAIT
displaying on the remote
controller for more than 2
minutes after power ON
Isn't
the power fuse (5A) on the
outdoor control PCB
blown?
NO
Is
AC380-415V detected at
the secondary side of
noise filter PCB terminal?
YES
Is
the connection of wire
between noise filter and
inverter PCBs OK?
YES
Does
indoor green LED keep
flashing?
YES
Does
indoor green LED flash
2 times?
YES
Are
the wires between indoor
and outdoor units
connected properly ?
YES
Is
AC380-415V detected
between L1-L2, L2-L3, L3-L1
respectively at outdoor
terminal block?
YES
Is
AC220-240V detected
between L-N at indoor
teminal block?
may be displayed. In such case, please wait for 3 minute after the power breaker OFF.
WAIT
WAIT
57
–
Content
WAIT
Once turn OFF the breaker
and turn ON it again at 3
minute after power OFF
Does it become normal?
NO
YES Replace fuse
is displayed on remote controller. If power ON/OFF is repeated
WAIT
" on the remote controller, the display changes to "INSPECT I/U"
–
(1)
Countermeasure
Refer next page
Replace noise filter PCB
NO
Connect wires correctly
NO
Indoor control PCB anomaly
NO
 Replace it
Indoor/outdoor control PCB
anomaly
 Replace it
Remote controller anomaly
NO
 Replace it
Breakage of wires for remote
controller
 Replace it
Correct the connecting wires
NO
between indoor and outdoor
units
Outdoor control PCB anomaly
NO
 Replace it
Breakage of connecting wire
NO
Noise
Indoor control PCB anomaly
YES
 Replace it