Mitsubishi Heavy Industries KXZ Series Service Manual page 75

Error code
Remote control:
WAIT
7-segment display:
1. Applicable model
All models
(No display on the remote
control 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 control anomaly
• Breakage of connecting wires
of remote control
• 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
control 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 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
terminal block?
73
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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)
Note (1)
YES
Model equipped with
transformer (Tr ) only
Is
DC10-11V between
X-Y at indoor control PCB
side when removing
remote control?
NO
NO
NO
NO
YES
-
'14 • KX-SM-221
(3)
Countermeasure
NO
Fuse blown
 Replace fuse.
NO
Transformer anomaly.
NO
Remote control wire
short-circuited.
YES
Remote control anomaly.
Indoor control PCB
anomaly.
Remote control anomaly.
Breakage of connecting
wires of remote control.
Correct the connecting
wires properly.
Outdoor control PCB
anomaly
 Replace it.
Breakage of connecting
wire
Noise.
Indoor control PCB
anomaly
 Replace it.