Communication Error At Initial Operation - Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual

Error code
Remote control:
WAIT
1. Applicable model
All models
2. Error detection method
3. Condition of Error displayed
4. Presumable cause
• Faulty indoor control or
power PCB
• Defective remote control
• Broken remote control wire
• Faulty outdoor control PCB
• Broken connection wires
Note:
LED Green Red
Keeps flashing Stays OFF
Indoor
Keeps flashing 2 times flash
Outdoor
5. Troubleshooting
Diagnosis
" " is still displayed on the
WA IT
remote control LED 2 minutes
after power ON.
YES
Is the outdoor
unit control green LED
flashing?
YES
Is the indoor
unit green LED flashing?
YES
Is the outdoor unit
control red LED flashing
twice?
YES
Are wires
connected properly between indoor/
outdoor units?
YES
Is approx.
DC20V detected between �-� on
the outdoor unit terminal
block?
YES
Is approx.
DC20V detected between �-� on
the indoor unit terminal
block?
146
-
Content
Communication error at
initial operation (1/3)
NO
To next page
NO
NO
NO
NO
NO
YES
-
'12 • PAC-T-178
Countermeasure
Defective indoor control
PCB ➞ Replace.
Defective indoor control PCB ➞
Replace.
Defective remote control ➞ Replace.
Broken remote control wire Y ➞
Replace.
Correct connection wires
between indoor and
outdoor units.
Defective outdoor control
PCB ➞ Replace.
Defective connection wire
(Broken)
Noise
Defective indoor control or
power PCB ➞ Replace.