LG TN-C090BT00, Service Manual

Page: 28 / 37

5. Error Mode & Corrective Method
Error mode
CH01
CH02
CH03
Cause of error
OPEN/SHORT of
room temp.
sensor
OPEN/SHORT of
indoor pipe temp.
sensor
Communication
Error
Remark Sensing condition of error
Voltage of sensing: Over 4.8V
Voltage of sensing: Less than
0.5V
1. Check the voltage of "CO1H"
on the remote controller.
2. Check the temp. sensor of
remtote controller.
1. Check the voltage between PIN 3
and 4 of CN-A cycle/CN-B cycle.
2. Check the temp. sensor of
indoor pipe.
1. Check the connecting wire
between main PCB remote
controller.
2. Check the input voltage of
remote-controller.
3. Check the wiring of
remote-controller.
Room
temp.(25 C)
= DC 2.5V
Pipe temp.(25 C)
= DC 2.2V
Input voltage of
remote-controller
= DC 12V
Voltage of sensing: Over 4.8V
Voltage of sensing: Less than
0.5V
Communication interruption
between remote controller and
Main PCB for 2 minutes.
Method of SVC
28
DŽ
DŽ
CH05
CH18
Communication of
indoor and outdoor
Error
Pressure Error
Pressure of system:
Hig er than high pressure
switch spec / lower than low
pressure switch spec.
1. Check the connection
between connecting cable
and T/B.
2. Check the sequence of the
connecting cable.
1. Check the refrigerant of
the system.
2. Check the leakage of system.
3. Check the pressure switch.
For all models
For TN-C180BT00/
TN-C240BT00.It
may at least one of
the four switches
has action.
Connecting cable connected to
indoor and outdoor unit connect
wrong or badness.
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