Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 61

Error code
Remote controller:
WAIT
7-segment display:
1. Applicable model
All models
(No display on the remote
controller 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:
LED Green Red
Keeps flashing Stays Off
Indoor
Keeps flashing Keeps flashing
Outdoor
5. Troubleshooting
Diagnosis
No display on the remote
controller after power ON
Does
indoor green LED keep
flashing?
YES
Does
outdoor red LED flash
2-times?
YES
Is
the connecting wires
between indoor and outdoor
units comnnected
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?
59
–
Content
WAIT
NO
Is
The fuse on indoor control
PCB OK?
YES
Is
AC18V or higher is
detected between Red-
Red at secondary side of
indoor transformer? (1)
YES Note (1) except FDT
and FDTC
Is
DC10-11V between
X-Y at indoor control PCB
side when removing
remote controller ?
NO
NO
NO
NO
YES
–
(3)
Countermeasure
NO
Fuse blown
 Replace fuse
NO
Transformer anomaly
NO
Remote controller wire
short-circuited
YES
Remote controller anomaly
Indoor control PCB
anomaly
Remote controller anomaly
Brakage of connecting
wires of remote controller
Correct the connecting
wires properly
Outdoor control PCB
anomaly
 Replace it
Breakage of connecting
wire
Noise
Indoor control PCB
anomaly
 Replace it