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Table 5.1 Abnormal Handling Method (continue)
NO
Problem
Content to check
Solution
4
Cannot connect to
computer for
management via
Modbus TCP. (LAN)
Is LAN wiring used with the specification?
Please use LAN cable above class 5, less than 100m.
Is there any abnormal for the LAN wiring (broken, short
circuit) (including HUB wiring situation when HUB is used)?
Replace with normal one.
Is there any abnormal on computer for management?
Replace with normal one.
Whether LAN wiring is parallel with computer wiring?
The wiring interval shall keep above 150mm.
The LAN light keeps on?
If computer for management and LAN wiring (including
connection has no abnormal, then it may be considered as
internal fault of the product. Please contact the closest repair
center.
5
Cannot connect to
computer for
management via
Modbus TCP. (WIFI)
Does the WIFI light remain off?
Please check whether computer for management is
successfully connected with WIFI signal “Modbus_AP”,
computer for management uses automatic access to IP address
mode.
Does the WIFI light remain on?
It may be considered as internal fault of the product. Please
contact the closest repair center.
6
Cannot connect to
computer for
management via
Modbus RTU. (RS-485)
Is the RS-485 wiring with designated specification?
Please use cable with cross-sectional area greater than
0.75mm
2
and total length within 1000m.
Is there any abnormal for RS-485 wiring (broken, short circuit)
Replace with normal one, confirm whether it’s A-A or B-B.
Whether the RS-485 wiring is parallel with computer wiring?
The wiring interval shall keep above 150mm.
Does the RS-485 light remain off?
Please re-confirm whether the wiring connection is normal.
Does the RS-485 light remain on?
In the circumstance that there’s no abnormal on the computer
for management, RS-485 wiring (including connection), then
it may be considered as internal fault of the product. Please
contact the closest repair center.
7
Computer for
management
(management software)
cannot control air
conditioner.
Whether all the connected air conditioners are powered on?
Please power on all the connected air conditioners.
Whether the terminal resistance setting on the H- NET cable is
normal?
Only 1 terminal resistance can be connected on the H- NET
cable.
Whether the address setting of the air conditioner is normal?
Please refer to the air conditioner installation instruction
manual to set the indoor and outdoor unit address again.
Whether the H- NET cable is broken?
Please check the wiring connection.
Whether the H- NET wiring is parallel with computer wiring?
The wiring interval shall remain above 150mm.
Whether H- NET wiring uses the wiring with designated
specification?
Please use cable with cross-sectional area greater than
0.75mm
2
and total length within 1000m.
Does H- NET light remain off?
Please check the connection of H- NET wiring.
Does H- NET light remain on?
It may be considered as internal fault of the product. Please
contact the closest repair center.
8
It flashes alarm code on
the digital tube of the
machine.
If the alarm code is “60”, “61”, “64”, “65”, please confirm the
H- NET wiring connection, refer to the lighting condition table
of each light in Table 2.6.
If the alarm code is not in the above, please refer to the air
conditioner installation instruction manual.
If the alarm code is “60”, “61”, “64”, “65”, it may be not
because that the indoor or outdoor unit is offline, it may be
because that the communication bus is busy.
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