Mitsubishi Electric FDT125VNVF Technical Manual page 422

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 interface kit PCB
Note:
If any error is detected 30 minutes after displaying "
"INSPECT I/U".
RUN light TIMER light
Indoor
– –
display
Green LED Red LED
Outdoor
Keeps flashing 2 times flash
control PCB
5. Troubleshooting
Diagnosis
YES
⑴， ⑵
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 interface kit have the
same address?
Are remote
controller wires laid
along high voltage
Is approx.
DC20V detected between �-�
on the interface kit terminal
Is approx.
DC20V detected between �-�
on the remote controller terminal
WAIT
421 421
- -
Content
INSPECT I/U
(When 1 or 2 remote controllers are connected)
Are 2 units
of remote controller
connected?
NO
⑵
Is it set
at the slave remote
controller?
Note (2)
"Slave" is displayed
on the remote
controller LCD.
NO
YES
NO
YES
wires?
NO
NO
block?
YES
NO
block?
YES
" on the remote controller, the display changes to
- -
'12 • PAC-T-174
Countermeasure
Set SW1 on remote
YES
controller PCB at "Master".
Set address again. (SW3 on
interface kit PCB)
Separate remote controller
wires from high voltage
wires.
Defective interface kit
PCB ➞ Replace.
Broken connecting wire ➞
Correct.
Defective remote controller
PCB ➞ Replace.