Inspect I/U (When 1 Or 2 Remote Controls Are Connected) - Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual

Error code
INSPECT I/U
Remote control:
1. Applicable model
All models
2. Error detection method
Communication between
indoor unit and remote control
is disabled for more than 30
minutes after the power on.
3. Condition of Error displayed
Same as above
4. Presumable cause
• Improper setting
• Surrounding environment
• Defective remote control
communication circuit
• Faulty indoor control PCB
Note:
If any error is detected 30 minutes after displaying "
"INSPECT I/U".
LED Green Red
Keeps flashing Stays OFF
Indoor
Keeps flashing 2 times flash
Outdoor
5. Troubleshooting
Diagnosis
YES
⑴， ⑵
Set one remote control
for "Master" and the other
for "Slave"
Note (1) Use SW1 to set at
master or slave.
Does it
become normal?
NO
Do more than
one indoor units have the
same address?
Are remote
control wires laid
along high voltage
Disconnect the connecting
wire � between the indoor
and outdoor unit.
Power supply reset
Does DM
start 60 seconds later
automatically.
WAIT
144
-
Content
INSPECT I/U
(When 1 or 2 remote controls are connected)
Are 2 units
of remote control
connected?
NO
⑵
Is it set
at the slave remote
control?
Note (2)
"Slave" is displayed
on the remote
control LCD.
NO
YES
NO
YES
wires?
NO
YES
NO
" on the remote control, the display changes to
-
'12 • PAC-T-178
Countermeasure
Set SW1 on remote control
YES
PCB at "Master".
Set address again. (SW2 on
indoor control PCB)
Separate remote control
wires from high voltage
wires.
Defective indoor control
PCB ➞ Replace.
Defective remote control ➞
Change.