SystemAir SYS WSC 86

40
Troubleshooting
Error code and
description
Possible Causes Possible Solutions
No display on the
wired controller
IDU is not powered on Power on the IDU.
Wired controller connection error
First power off the IDU, and then check if
the wired controller connection is correct.
See Section 3.4 on the wiring requirements.
Wired controller damaged Replace the wired controller.
Power supply failure of the IDU main PCB Replace the IDU main PCB.
E9
Wired
controller
and IDU
communi
cation
fault
IDU has no address or IDU address
duplicated
Set an address for the IDU; duplicated IDU
addresses are not allowed in the same
system.
Wired controller damaged Replace the wired controller.
IDU main PCB fault Replace the IDU main PCB.
Some functions of
the indoor unit
cannot be
controlled, such
as ON/OFF,
temperature, mode,
fan speed and
wired
controller lock.
The " "
icon in the wired controller is
always on.
Check if the indoor unit has been locked by
the centralized controller.
Table 8.1