Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 196

Error code
Remote control:
WAIT
1. Applicable model
Models FDC71-140
2. Error detection method
3. Condition of error displayed
4. Presumable cause
• Faulty noise filter
• Faulty indoor unit control
PCB
• Faulty outdoor unit control
PCB
• Faulty inverter PCB
• Faulty fan motor
Note:
LED Green Red
Keeps flashing Stays OFF
Indoor
Keeps flashing 2-time flash
Outdoor
5. Troubleshooting
Diagnosis
Diagnosis for when the outdoor unit
control PCB LED is turned off
Shut down the breaker and back on
again the breaker 3 minutes later.
From previous page
NO
Does it reset normally?
Isn't the outdoor
unit controller power source fuse
(71:20A, 100-140:30A) blown?
To check method for inverter PCB before
replacment of blown power source 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 unit control
PCB blown?
YES
Is DC5V
detected on the outdoor unit control PCB (Between
➀-➃ of CNV)?
YES
Is DC5V detected
if the connector of outdoor fan motor
is disconnected?
YES
Is DC5V detected
if the inverter power source connector (CNI2)
is disconnected?
195
-
Communication error at
Content
initial operation (2/3)
(Models FDC71-140)
YES
Note (1) 1-phase model only
(1)
NO
To next page
NO
NO
NO
NO
NO
NO
YES
-
'19 • PAC-T-327
Countermeasure
Normal. (Malfunction by
noise)
Replace noise filter.
Check connection of diode
stack and electrolytic
capacitor by refering main
electrical circuit diagram
Defective outdoor unit
control PCB ➞ Replace.
Defective outdoor unit
control PCB ➞ Replace.
Defective outdoor fan
motor
Defective inverter PCB
➞ Replace.
Defective outdoor unit
control PCB ➞ Replace.