Power Supply System Error (Power Supply To Indoor Control Pcb); Power Supply System Error (Power Supply To Remote Control) - Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual

Error code
None
Remote control:
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 control or
power PCB
• Broken harness
• Faulty outdoor control PCB
(Noise filter)
Note:
LED Green Red
Stays OFF Stays OFF
Indoor
(Power supply to indoor control PCB)
Stays OFF 2 time flash
Outdoor
5. Troubleshooting
Diagnosis
Is
AC220/240V
detected between 1 and
2 on the terminal block
of indoor
unit?
YES
Are fuses OK?
(F3 or F4)
YES
Is DC5V
detected between �-�
of CNW1?
Note (2) � for GND
YES
Is JX1 open?
142
-
Power supply system error
Content
NO
Is
AC380/415V
for 3-phase unit detected
between 1, 2 and 3 on the teminal
block of outdoor unit or is AC220/240V
for 1-phase unit detected between
1 and 2 on the terminal
block of outdoor
unit?
YES
NO
Is the
check of resistance between
�-� of CNW0
OK?
YES
Is the
checked result
of resistance of FM,
etc OK?
YES
(2)
NO
NO
YES
-
'12 • PAC-T-178
Countermeasure
Defective outdoor control
NO
PCB (Noise filter)
Misconnection or breakage
of connecting wires
Defective indoor power
NO
PCB ➞ Replace.
Replace FM, etc.
NO
Replace fuse.
Defective indoor power
PCB ➞ Replace.
Open JX1.
Defective indoor control
PCB ➞ Replace.