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Indoor Device ERV or ERV DX AWHP(Hydro kit) AHU
20
 
ERV DX Main
PCB Sub PCB
communication error
Elec/heater error
 
Outdoor Unit Errors
Error
Code
Description
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
145


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