LG ARTCOOL Series Service Manual page 41

Part 4 Trouble Shooting Guide
7.3.2 Error code 02
Discription
• Outdoor TH. is short or open
Supposed
• Outdoor TH. is not connected to the outdoor unit PCB assembly.
Causes
• Damage or defect on the sensing circuit of outdoor unit PCB assembly.
(R03H~R06H, C02H, C03H)
Outdoor TH. is connected to
outdoor unit PCB assembly ?
Yes
Outdoor TH. is working
properly?
Yes
Sensing circuit of outdoor
unit PCB is operating properly?
Yes
* The outdoor unit PCB still has some
problem.
* Replace outdoor unit PCB.
Be sure to disconnect the power cable plug from the plug socket before disassembling the
equipment for a repair. Internal components and circuit boards are at main potential when the
equipment is connected to the power cables. This voltage is extremely dangerous and may
cause death or severe injury if come in contact with it.
Be sure to turn off power switch before connect or disconnect connector, or parts damage may
be occurred.
Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Outdoor TH.(Thermistor) is short or open
No
* Connect to CN-TH1 in outdoor
unit PCB assembly
* Check outdoor TH.
No
- Measure resistance of TH.
(air : about 10kΩ at 25°C,
pipe : about 5kΩ at 25°C)
- If it is not, replace the thermistor.
No
* Check soldering state of
R03H ~ R06H, C02H, C03H
* If it is broken, replace outdoor unit
PCB
- 40 -
LGE Internal Use Only