Inspect I/U (When 1 Or 2 Remote Controllers Are Connected) - Mitsubishi Heavy Industries FDT Series Technical Manual

Error code
INSPECT I/U
Remote controller:
1. Applicable model
All models
2. Error detection method
Communication between indoor
unit and remote controller
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 controller
communication circuit
• Faulty indoor control PCB
Note:
If any error is detected 30 minutes after displaying "
"INSPECT I/U".
LED Green Red
Stays OFF
Indoor
Outdoor
5. Troubleshooting
Diagnosis
YES
Set one remote controller
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
controller wires laid
along high voltage
wires?
Disconnect the connecting
wire between the indoor
and outdoor unit.
Power supply reset
Does DM
start 60 seconds later
automatically.
WAIT
- 374
Content
INSPECT I/U
(When 1 or 2 remote controllers are connected)
Are 2 units
of remote controller
connected?
NO
Is it set
at the slave remote
controller?
Note (2)
"Slave" is displayed
on the remote
controller LCD.
NO
YES
NO
YES
NO
YES
NO
" on the remote controller, the display changes to
-
'12 • PAC-T-173
Countermeasure
Set SW1 on remote
YES
controller PCB at "Master".
Set address again. (SW2 on
indoor control PCB)
Separate remote controller
wires from high voltage
wires.
Defective indoor control
PCB Replace.
Defective remote controller
Change.