Mitsubishi Heavy Industries SRK20ZJX-S Service Manual page 87

Error code
Remote controller:
INSPECT I/U
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 or
power PCB
• Faulty outdoor sub PCB
Note:
If any error is detected 30 minutes after displaying "
"INSPECT I/U".
LED Green Red
Keeps flashing Stays OFF
Indoor
– Stays OFF
Outdoor
5. Troubleshooting
Diagnosis
Are more than
3 units of remote controller
connected?
NO
Does remote
controller display
"Slave"?
NO
Do more than
one indoor units have the
same address?
NO
Is it set to
a slave indoor unit.
SW5-1, 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
WAIT
86
-
Content
INSPECT I/U
(Connection of 3 units or more remote controller)
YES
YES
YES
YES
YES
NO
NO
NO
" on the remote controller, the display changes to
-
'10 • SCM-SM-094
Countermeasure
Reduce to 2 units or less.
Change remote controller
setting to "Master". (SW1
on remote controller PCB)
Change address. (SW2 on
indoor control PCB)
Change to master. (SW5-1,
2 on indoor control PCB)
Correct
Correct
Defective outdoor sub PCB
Replace.
Broken connecting wire
Correct.
Defective indoor control or
power PCB Replace.