Mitsubishi Electric FDT125VNVF Technical Manual page 423

Error code
INSPECT I/U
Remote controller:
1. Applicable model
All models
2. Error detection method
Indoor unit cannot communicate
for more than 30 minutes after
the power on with remote
controller.
3. Condition of Error displayed
Same as above
4. Presumable cause
• Improper setting
• Surrounding environment
• Defective remote controller
communication circuit
• Faulty indoor control PCB
• Faulty outdoor control PCB
• 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
Are more than
3 units of remote controller
connected?
NO
Does remote
controller display
"Slave"?
NO
Do more than
one interface kit have the
same address?
NO
Is it set to
a slave interface kit.
SW3-1, 2?
NO
Is there loose
or wrong connection at the termanal
of wiring between indoor and
outdoor units?
NO
Is the
grounding wire connected
properly?
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
Is approx.
DC20V detected between �-�
on the interface kit terminal
block?
YES
WAIT
422 422
- -
Content
INSPECT I/U
(Connection of 3 units or more remote controller)
YES
YES
YES
YES
YES
NO
NO
NO
NO
" on the remote controller, the display changes to
- -
'12 • PAC-T-174
Countermeasure
Reduce to 2 units or less.
Change remote controller
setting to "Master". (SW1
on remote controller PCB)
Set address again. (SW1 on
interface kit PCB)
Change to master. (SW3-1,
2 on interface kit PCB)
Correct
Correct
Defective outdoor control
PCB ➞ Replace.
Defective indoor control
PCB ➞ Replace.
Broken connecting wire ➞
Correct.
Defective interface kit
PCB ➞ Replace.