Mitsubishi Heavy Industries SRK100VNXWZRF Service Manual page 84

Error code
INSPECT I/U
Remote control:
1. Applicable model
All models
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
• 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 unit
control PCB
Keeps flashing 2-time flash
5. Troubleshooting
Diagnosis
Are more than
3 units of remote control
connected?
NO
Does remote
control 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 terminal
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
83
-
Content
INSPECT I/U
(Connection of 3 units or more remote controls)
YES
YES
YES
YES
YES
NO
NO
NO
NO
" on the remote control, the display changes to
-
'22 • PAC-SM-422
Countermeasure
Reduce to 2 units or less.
Change remote control
setting to "Master". (SW1
on remote control PCB)
Set address again. (SW1 on
interface kit PCB)
Change to master. (SW3-1,
2 on interface kit PCB)
Correct it.
Correct it.
Defective outdoor unit
control PCB➞Replace.
Defective indoor unit
control PCB➞Replace.
Broken connecting wire➞
Correct it.
Defective interface kit
PCB➞Replace.