Toshiba MM-A0280HT Service Manual page 67

Reduction in the No. of
connected outdoor units
Is the system setup of the slave
outdoor unit being completed?
Is the power supply of the slave
outdoor unit turned on?
Is communication
cable connected correctly
between the outdoor units?
Is the BUS communication
connector (CN601) of the outdoor
unit at the server connected?
Check interface P .C. board.
14
Outdoor unit connection
Is the No. of connected
outdoor units 5 or below?
Is the communication
between outdoor units?
Check interface P .C. board.
Troubleshooting
Diagnostic Procedure for Check Code
Check code
[8d]
Yes
No
No
Yes
No
Yes
No
Yes
Check code
[8E]
over limit
No
Yes
No
cable connected
Yes
Operation cause
1. Outdoor unit system setup
2. Outdoor unit power source
3. Connection error of communication cable between
outdoor units
4. Connection error of BUS communication
5. Interface P .C. board error
Clear the alarm,and the operation
Check the connection of the connector.
(BUS communication connector: CN601)
( *1) How to clear the alarm
Set SW01/SW02/SW03 on interface P .C. board
of the master outdoor unit to 2/16/1
respectively, and push SW04 for 5 seconds.
(Display on the 7 segment display: [Er.] [CL])
Operation cause
1. No. of connected outdoor units over limit
2. Connection error of communication cable
between outdoor units
The maximum number of
outdoor units is 5.
68
starts (*1).
Turn on the power supply.
Check connection of
communication cable.
Check connection of
communication cable.