LG ACHH Series Manual page 56

Error code check
Error number
03 HMI communication error
n Failure diagnosis method n Failure diagnosis method
Is polarity of a
communication line properly
matched?
Yes
Is an address setting
between HMI and
Chiller board
properly performed?
Yes
Is a communication
error occurrence confirmation
error occurred by replacing a
chiller board?
Yes
Check confirmation by
replacing HMI
[Note 2] Confirm an address by confirming below Chiller board setting
Option Setting
Press SW_COMF Button to move to O Level Setting Screen.
Press Up or Down (▲▼) Button to go to a desired function.
If the desired function shows, press SW_COMF Button.
Then, the Screen moves to 1 Level Setting.
Press Left or Right (◀▶) Buttons to go to a desired function. And Press SW_COMF Button to set the function.
To go to the previous, press SW_BACK Button.
Description
Central Control Address
The product address can be set for communication with other communication devices. The address can Be set by selecting values from 1-247.
Errors
In case where the communication
between HMI and a chiller board is not
[Note 1]Check the connection
No
by referring to a figure and a
connection map.
Match a service setting
address of HMI and a chiller
board address.
No
[Note 2]
(After the chiller board address
setting, a chiller board power
should be reset)
Finish with a chiller board
No
replacement due to a chiller
board problem
Screen Displays(0 Level)
A
Meaning
performed for 30 second
[Note 1] Insert a terminal paying attention to the communi-
cation polarity as a figure.
D D R
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Main cause of occurrence
1. Communication polarity connection
defect
2. Address setting non-agreed
3. Chiller PCB defect
4. HMI defect
Screen Displays(1 Level)
1