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