Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 188

Error code
Remote control: None
1. Applicable model
All models
2. Error detection method
3. Condition of error displayed
4. Presumable cause
• Misconnection or breakage of
connecting wires
• Blown fuse
• Faulty transformer
• Faulty indoor unit control
PCB
• Broken harness
• Faulty outdoor unit control
PCB (Noise filter)
Note:
LED Green Red
Indoor Stays OFF Stays OFF
(Power source to indoor unit control PCB)
Outdoor 2-time flash
Keeps flashing
5. Troubleshooting
Diagnosis
Is
AC220/240V
detected between and
on the terminal block
of indoor
unit?
YES
Are fuses OK
(F1,2)
YES
(1)
Is DC5V
detected between -
of CNW2?
Note (1)  for GND
YES
Is JX1 open?
187
-
Content Power source system error
NO
Is
AC380/415V
for 3-phase unit detected
between , and on the teminal
block of outdoor unit or is AC220/240V
for 1-phase unit detected between
and on the terminal
block of outdoor
unit?
NO
Is the
check of resistance between
Œ-Ž of CNW0
OK?
YES
Is the
checked result
of resistance of FM,
LM, etc
OK?
-
'19 • PAC-T-327
Countermeasure
Defective outdoor unit
NO
control PCB (Noise filter).
Misconnection or breakage
YES
of connecting wires.
Defective indoor unit
NO
control PCB ➞ Replace.
Replace FM, LM, etc.
NO
Replace fuse.
YES
Defective indoor unit
NO
control PCB ➞ Replace.
Open JX1.
NO
Defective indoor unit
YES
control PCB ➞ Replace.