Outdoor Unit Errors - LG AC Smart Premium PQCSW421E0A User Manual

Error
Indoor Device
Code
20

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
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
ERV or ERV DX
ERV DX Main
PCB Sub PCB
communication error
Description
PFC)
AWHP(Hydro kit)
Elec/heater error
Hint
137
AHU