Mitsubishi FDC121KXZEN1-W - Page 229

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