Mitsubishi FDT71VH - Wait; INSPECT I;U (Connection of 3 Units or more Remote Controls)

-
91
-
'20 • PAC-SM-351
Error code
Remote control:
LED Green Red
Indoor
Outdoor
Content
INSPECT I/U
INSPECT I/U
(Connection of 3 units or more remote controls)
Keeps ashing Stays OFF
Keeps ashing 2-time ash
1. Applicable model
5. Troubleshooting
Diagnosis Countermeasure
Reduce to 2 units or less.
Change remote control
setting to “Master”. (SW1
on remote control PCB)
Change address. (SW2 on
indoor unit control PCB)
Change to master. (SW5-
1, 2 on indoor unit control
PCB)
Correct.
Correct.
Defective outdoor unit
control PCB
➞
Replace.
Broken connecting
wire
➞
Correct.
Defective indoor unit
control PCB
➞
Replace.
2. Error detection method
Indoor unit cannot communicate
for more than 30 minutes after
the power on with remote
control.
3 . Condition of error displayed
Same as above
4. Presumable cause
• Improper setting
• Surrounding environment
• Defective remote control
communication circuit
• Faulty indoor unit control
PCB
• Faulty outdoor unit control
PCB
Note:
If any error is detected 30 minutes after displaying “
WAIT
” on the remote control, the display changes to
“INSPECT I/U”.
NO
NO
NO
NO
NO
Are more than
3 units of remote control
connected?
Does remote
control display
“Slave”?
YES
Do more than
one indoor units have the
same address?
Is it set to
a slave indoor unit?
(
SW5-1, 2
)
Is there loose
or wrong connection at the termanal
of wiring between indoor and
outdoor units?
Is the
grounding wire connected
properly?
Is approx.
DC20V detected between ➁-➂
on the outdoor unit terminal
block?
Is approx.
DC20V detected between ➁-➂
on the indoor unit terminal
block?
YES
YES
NO
NO
NO
YES
YES
YES
YES
YES