Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual page 304

Error code
Remote control:
WAIT
1. Applicable model
All models
2. Error detection method
3. Condition of Error displayed
4. Presumable cause
• Faulty noise filter
• Faulty indoor control PCB
• Faulty outdoor control PCB
• Faulty inverter PCB
• Faulty fan motor
Note:
LED Green Red
Keeps flashing Stays OFF
Indoor
Keeps flashing 2 times flash
Outdoor
5. Troubleshooting
Diagnosis
Diagnosis for when the outdoor
control PCB LED is turned off
From previous
Shut down the breaker and back on
page
again the breaker 3 minutes later.
NO
Isn't the outdoor
unit controller power supply fuse
(30A) blown?
To check method for inverter PCB before
replacment of blown power supply fuse.
YES
Is AC220/240V or
AC380/415V detected at the noise filter
secondary side?
YES
Is DC255-310V detected at CNA2?
YES
Isn't fuse
〔250V, 2A〕 on the outdoor control
PCB blown?
YES
Is DC5V
detected on the outdoor control PCB (Between
�-� of CNV)?
YES
Is DC5V detected
if the connector of outdoor unit fan motor
is disconnected?
YES
Is DC5V detected
if the inverter power supply connector (CNI2)
is disconnected?
303
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Content
Communication error at
initial operation (2/3)
Does it reset normally?
YES
Note (1) 1-phase model only
(1)
NO
To next page
NO
NO
(2)
NO
NO
NO
NO
YES
-
'12 • PAC-T-178
Countermeasure
Normal (Malfunction by
noise)
Replace noise filter.
Check connection of diode
stack and electrolytic
capacitor by refering main
electrical circuit diagram
Defective outdoor control
PCB ➞ Replace.
Defective outdoor control
PCB ➞ Replace.
Defective outdoor fan
motor
Defective inverter PCB
➞ Replace.
Defective outdoor control
PCB ➞ Replace.