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Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Checking Key Components of Indoor Unit
1.4 Control Panel
To solve various troubles while using control panel, please read following FAQ (Frequently Asked Questions).
For your convenience, all questions are classified according to topics.
No
Topic
Question
Answer
1
2
3
4
Power button does
not bright
Some icons are dis-
played automatically
Water tank heating
or related features
are not permitted
System installation is fin-
ished. Also, all wirings
including power connection
is all right. But when the
power button in front of the
control panel is pushed, it
does not bright.
Although nobody touched
control panel, someties it
displays specific icons and
the system operates auto-
matically.
Setting water tank temper-
ature is not permitted
although the water tank is
installed.
• There can be a problem in wiring between PCB and
control panel. Open control box and find ‘CN_REMO’
connector at the PCB. If the connector is empty or noth-
ing is connected, please connect it with end of wire
which is from control panel then restart the system.
• Check if external controller is connected like thermostat.
If thermostat is connected to the system and it is config-
ured exactly, you can see ‘Thermostat Icon ( )’ at
the display of the control panel. It is normal condition
that power button of control panel does not work when
thermostat is installed.
• It is normal condition. Basically, two features can be operat-
ed without user’s decision – one is system protective opera-
tion, the other is ‘background water tank heating operation’,
which is heating inside the water tank while space heating is
not used or the system is not working. System protective
operation is, as letter says, for the purpose of securing the
system from worse condition. Anti-freezing operation, for
example, is one of the protective operation. It is essential to
start protective operation to prevent potential malfunction
and to keep possible accidents. On the other hand, back-
ground water tank heating operation is not protective opera-
tion but to supply warm water to end-user. The background
water tank heating operation is only started when the water
tank temperature is under the specific temperature.
Following two conditions should be satisfied.
• Check if ‘Water tank enable/disable’ button is correctly
pushed or not. To use water tank, end-user must push
button and highlight icon. Otherwise, water tank heat-
ing is disabled.
• Also, check if DIP switch setting is correct or not. To identify
the DIP switch setting, open the control box inside the
indoor unit. Unless 2nd and 3rd pin of DIP switch setting is
01(OFF-ON) or 10(ON-OFF), the water tank heating will not
be configured.
