LG ARTCOOL Series Service Manual page 45

Part 4 Trouble Shooting Guide
7.3.6 Error code 07
Discription
• Supplied power is not normal
• Indoor/outdoor fan is locked
Supposed
Causes
• Too much refrigerant
• Defect in current sensing circuit in outdoor unit PCB assembly
Supplied voltage to
Outdoor PCB is about
AC 220/240V ?
Yes
Does indoor / outdoor fan work
running properly?
Yes
Refrigerant pressure is within
limits ?
Yes
Current sensing circuit is working
properly ?
No
* Check current sensing circuit.
Check the Current Trans. is damaged in outdoor unit PCB (output wire is
disconnected to pin or not)
- Some component in the PCB is broken, It makes this problem.
If problem still persists, Replace the 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
Over current Error (CT2)
No
Check power source
*Check the indoor /outdoor fan motor
No
and air circulation condition.
*Low air circulation may cause this
problem
No
Check refrigerant pressure and adjust.
It 's normal to protect the unit
Some overload may lead to this error
Yes
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