DC Inverter Multi VRF System
30
Error
Code
Content
Error
Code
Content
HE Phase-lacking of inverter fan GC
Photovoltaic DC hardware overcurrent
protection
Drive charging circuit malfunction of fan
Grid side hardware overcurrent protection
Failure startup of inverter fan
High or low photovoltaic voltage protection
HP AC current protection of inverter fan GF
DC bus neutral-point potential unbalance
protection
AC input voltage of drive of inverter fan
Grid side module high-temperature protection
Grid side current sensor protection
Grid side temperature sensor protection
Insulation resistance protection
Charging circuit protection
Gy Unrecoverable error of grid drive (photovoltaic) Gb Grid side relay protection
Debugging:
Content
Content
U0 Preheat time of compressor is insufficient Cd
Communication malfunction between mode
exchanger and ODU
U2 Wrong setting of ODU’s capacity code/jumper cap Cn
Malfunction of network for IDU and ODU of
mode exchanger
U3 Power supply phase sequence protection Cy Communication malfunction of mode exchanger
U4 Refrigerant-lacking protection C0
Communication malfunction between IDU,
ODU and IDU’s wired controller
U5 Wrong address for driving board of compressor C1
Communication malfunction between main
control and DC-DC controller
U6 Alarm because valve is abnormal C2
Communication malfunction between main
control and inverter compressor driver
U7 Power grid DRED0 response protection C3
Communication malfunction between main
control and inverter fan driver
U8 Short-circuit malfunction of IDU C4 Malfunction of lack of IDU
U9 Malfunction of pipe-line for ODU C5
Alarm because project code of IDU is
inconsistent
DC bus overvoltage protection at power grid side
Alarm because ODU quantity is inconsistent
UH DC bus undervoltage protection at power grid side C7 Abnormal communication of converter
Setting of main IDU is successful
Emergency status of compressor
UL
Emergency operation DIP switch code of
compressor is wrong
C9 Emergency status of fan
UE Charging of refrigerant is invalid CA Emergency status of module
UF
Identification malfunction of IDU of mode
exchanger
CH Rated capacity is too high
UJ FO protection for PV module CC Malfunction of lack of main control unit
Ud Grid-connected driver board error CL Rated capacity is too low
Un
Communication malfunction between main control
and inverter
CE
Communication malfunction between mode
exchanger and IDU
Uy Over-temperature protection for PV module CF Malfunction of multiple main control units
CU
Communication malfunction between IDU and the
receiving lamp plate
CJ Address DIP switch code of system is shocking
Cb Overflow distribution of IP address CP Malfunction of multiple main wired controllers
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