Mitsubishi Heavy Industries KXZ Series Service Manual page 78

Error code
Remote control:
WAIT
7-segment display: –
1. Applicable model
All models
(In case of fuse blown, how
to check the unit before
replacement of fuse.)
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
Stays OFF Stays OFF
Indoor
Stays OFF Stays OFF
Outdoor
5. Troubleshooting
Diagnosis
From previous page.
B
Isn't
there any short circuit
between phases of noise
filter?
NO
Isn't
there any short circuit
between phases at input
terminal of inverter
PCB?
NO
Isn't
there any crack or damage
on power transistor module
or diode stack?
NO
Isn't
there any anomaly on
reactor?
NO
Isn't
there any anomaly on
electrolytic capacitor?
NO
Replace power fuse
76
-
Content
WAIT
YES
Replace Noise filter
YES
YES
Replace inverter PCB
YES
Replace reactor
YES
Replace electrolytic
capacitor
-
'14 • KX-SM-221
(6)
Countermeasure