[8D] Reduction In The No. Of Connected Outdoor Units; [8E] Outdoor Unit Connection Over Limit - Toshiba HFCR407C Service Manual

Diagnostic procedure for check code
Check code
[8d]
Reduction in the No. of
connected outdoor units
Is the system set-up of the slave
outdoor unit being completed?
No
Is the power supply of the
slave outdoor unit turned on?
Yes
Is communication cable
connected correctly between
the outdoor units?
Yes
Is the BUS communication
connector (CN601) of the
outdoor unit at the server
connected?
Yes
Check interface PC board.
Check code
[8E]
Outdoor unit connection
over limit
Is the No. of connected
outdoor units 5 or below?
Yes
Is the communication cable
connected between outdoor
units?
Yes
Check interface PC board.
Troubleshooting
Operation cause
1. Outdoor unit system set-up
2. Outdoor unit power source
3. Connection error of communication cable between
outdoor units
4. Connection error of BUS communication
5. Interface PC board error
Yes
No
No
No
( *1) How to clear the alarm
Set SW01/SW02/SW03 on interface PC 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
No
No
89
Clear the alarm, and the operation starts (*1).
Turn on the power supply.
Check connection of communication cable.
Check the connection of the connector.
(BUS communication connector: CN601)
The maximum number of outdoor units is 5.
Check connection of communication cable.
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