LG General Wall Mounted-Inverter Type Svc Manual page 53

Error code Description
Over current Error
7
(CT2)
Check flow
Supplied voltage to
Outdoor pcb is about
AC 208~230V ?
No
Check power source
YES
Current sensing circuit is right ?
Check current sensing circuit.
- check CT is damaged in outdoor pcb
(output wire is disconnected to pin or not)
- BD01N is inserted in right position
(refer marking on pcb and component)
- Spec of R01N (1kΩ), R02N (1.65kΩ) is correct
- Direction of diode (D01N, D02N) is right
• Supplied power is not normal
• Indoor/outdoor fan is locked
• Too much refrigerant
• Defect in current sensing circuit in outdoor pcb assembly
YES
Does indoor / outdoor fan work
normally ?
No
Check indoor / outdoor fan and
adjust.
No
Part 4 Trouble Shooting
Cause of error
YES
Refrigerant pressure is right ?
No
Check refrigerant pressure
and adjust.
Service Manual 53