Mitsubishi Heavy Industries FDT71VNXVD Service Manual page 56

Error code
WAIT
Remote controller:
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 controller
• Broken remote controller wire
• Faulty outdoor control PCB
• Broken connection wires
Note:
LED Green Red
Content
Indoor Keeps flashing Stays OFF
Outdoor Keeps flashing 2 times flash
5. Troubleshooting
Diagnosis
WAIT
" " is still displayed on the
remote controller 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?
YES
6
- -
Communication error at
initial operation (1/3)
A
NO
NO
NO
NO
NO
NO
-
'10 • PAC-SM-137$
Countermeasure
See next page.
Defective indoor control
PCB Replace.
Defective indoor control PCB
Replace.
Defective remote controller Replace.
Broken remote controller 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.