Mitsubishi Heavy Industries KXZ Series Technical Manual page 174

Error code
E31
Remote control:
E31
7-segment display:
1. Applicable model
Outdoor unit
2. Error detection method
When the microcomputer of
outdoor control PCB recognizes
the duplicated address No.
by scanning all addresses
of outdoor units in the same
Superlink system
3. Condition of error displayed
When duplicated outdoor unit
address No. exists in the same
Superlink system
4. Presumable cause
• Mistake in the address setting
of outdoor units
• More than 129 indoor units
connected
[
Maximum number can be set
by address switch is 128 units
• No setting of Master/Slave
setting switch for combination
use
• Outdoor unit control PCB
anomaly
Note: After taken above measure, reset the power source and confirm no error is displayed occurs.
Unless the power source is reset after changing address, the set address will not be confirmed.
In case of combination use, set the same address to both master and slave units. Distinction of master or slave unit is done by
setting SW4-7 and 4-8. (Refer the instruction manual and technical manual for details)
LED Green
Keeps flashing Stays OFF
Indoor
Keeps flashing 1-time flash
Outdoor
5. Troubleshooting
]
Red
Content
Duplicated outdoor unit address No.
Diagnosis
Save data for 30 minutes before
stopping in Mente PC.
Reset the power supply
and restart operation.
Caution:
Unless the power source is reset after
changing address, the set address will
not be confirmed.
Does E31 recur?
YES
Check outdoor address Nos.
in the same Superlink system.
Does the same
address No. exist?
171
- -
'21 • KX-T-380
Countermeasure
Check and save the data of
operating condition.
Check the conditions
whether it occurs immediately
after the power on or
during operation.
Check the current address
Nos. of outdoor units.
Test run
NO
*No action is taken because
it is judged that the power
source reset is not done
after changing address.
Correct address.
YES
Replace outdoor control
NO
PCB. *
* Before replacement,
please confirm whether
the rotary switch for
address setting is not
damaged.
(It was experienced that
No. 5 on rotary switch
was not recognized.)