Mitsubishi KXZ Series Technical Manual page 244

Error code
Remote control: None
7-segment display:
1. Applicable model
FDT, FDTC, FDK series only
2. Error detection method
3. Condition of error displayed
4. Presumable cause
• Wrong connection or breakage
of connecting wires
• Blown fuse
• Indoor unit PCB anomaly
• Broken harness
Note:
LED Green Red
Stays OFF Stays OFF
Indoor
Stays OFF
Outdoor
5. Troubleshooting
Diagnosis
Is
AC 220-240V
detected between L-N on
the indoor terminal
block?
YES
Note (1)
Check the fuse at the power source side.
(1)
Are fuse(F1) OK?
YES
Is DC280V detected
between CNM FDT, FDTC: ① - ④,
FDK: ① - ③ ?
YES
Is DC8V detected
between CNP ① - ② ?
YES
Is JX1 open?
227
-
Content Power source system anomaly
(Power source to indoor unit PCB)
NO
NO
Is resistance
between ① - ③ of CNW0
OK?
YES
(2)
Is resistance
to FM, LM and etc.
OK?
Note (2) LM: Louver motor
FM: Fan motor
NO
NO
None of
actuator, etc. is
short-circuited?
YES
NO
-
'20 • KX-T-373
Countermeasure
Wrong wiring or broken
wires between indoor units
and power source line
Indoor unit PCB
NO
anomaly  Replace it.
Replace FM, LM and etc.
YES
Replace fuse.
NO
Indoor unit PCB
anomaly  Replace it.
Replace related parts.
NO
Defective indoor unit
PCB  Replace.
Open JX1.
Defective indoor unit
PCB → Replace.