Mitsubishi Heavy Industries FDT Series Technical Manual page 381

Error code
WAIT
Remote controller:
1. Applicable model
Models FDC71-140
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
Stays OFF
Indoor
Outdoor
5. Troubleshooting
Diagnosis
Diagnosis for when the outdoor
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 supply fuse
(71:20A, 100-140:30A) 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?
- 380
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
-
'12 • PAC-T-173
Countermeasure
Normal (Malfunction by
noise)
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.