Outdoor Unit Errors - LG BACnet Touch Installation & Owner's Manual

Outdoor Unit Errors

Error Code
21 DC peak
22 Max ct (CT 2): Maximum current error
23 DC link voltage (low)
24 High voltage/heat plate SW
25 Under-voltage/over-voltage
26 DC comp position error
27 PSC fault error
28 DC link voltage (high)
29 Comp over-current
30 Surge in static speed #2 compressor discharge temperature
31 CT err (low current)
32 Inverter discharge temperature error (high)
33 Surge in static speed #1 compressor discharge temperature
34 Surge in high voltage
35 Drop in low voltage
36 Low compression ratio error
37 Compression ratio limit exceeded
39
Communication error (inverter ↔ PFC)
40 Inverter CT sensor open/short
41 Inverter discharge temperature sensor open/short
42 Low voltage sensor open/short
43 Heat exchanger temperature sensor (top)
44 Outdoor air temperature sensor open/short
45 Outdoor pipe (top) sensor open/short
46 Compressor suction temperature sensor open/short
47 Static speed #1 compressor discharge temperature sensor error
Heat exchanger temperature sensor (bottom) (SUPER3: Static speed #2
48
compressor discharge temperature sensor error)
49 Outdoor voltage sensor error (SUPER3: IPM temperature sensor error)
50 Missing phase of outdoor 3-phase power
51 Over-capacity error (indoor unit capacity limit exceeded)
52 Communication error (inverter board → main board)
53 Communication error (indoor device → outdoor unit)
54 RST reverse phase detection
Description
73
Troubleshoot