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40
Tr
oubleshoo
ting
4
Troubleshooting
Error Codes and Messages
PCS error codes
Code
Message
Description
Solution
P301
BMS CAN Comm Fault
Communication error with the
connected battery for over 10
seconds.
Contact service center.
P302
PMS Comm Fault
Communication error on PCS
system.
Fault Reset & Restart
P303
DSP SCI Comm Fault
Communication error with
the processing unit for over a
minute.
Contact service center
P304
Meter Comm Fault
Communication error with the
smart meter.
Stop, Fault Reset & Restart
P305
Grid Relay(L1-1) F
Grid relay is not operable.
(L1-1)
Automatically reboot within a
minute.
P306
Grid Relay(L2-1) F
Grid relay is not operable.
(L2-1)
Automatically reboot within a
minute.
P307
Grid Relay(L3-1) F
Grid relay is not operable.
(L3-1)
Automatically reboot within a
minute.
P308
Grid Relay(N-1) F
Grid relay is not operable.
(N-1)
Automatically reboot within a
minute.
P309
Grid Relay(L1-2) F
Grid relay is not operable.
(L1-2)
Automatically reboot within a
minute.
P310
Grid Relay(L2-2) F
Grid relay is not operable.
(L2-1)
Automatically reboot within a
minute.
P311
Grid Relay(L3-2) F
Grid relay is not operable.
(L3-2)
Automatically reboot within a
minute.
P312
Grid Relay(N-2) F
Grid relay is not operable. (N-2) Automatically reboot within a
minute.
P315
PCS IGBT Fault
The PCS IGBT is not operable.
Automatically reboot within a
minute.
P316
ESS Fan Fault
The cooling fan in the product is
in fault.
Automatically reboot within a
minute.
P317
Fault Reset Fail
Fault reset has been failed 3
times.
Contact service center.
P318
Fuction Safety F
The processing unit has a
hardware fault.
Automatically reboot within a
minute.
P320
DSP SCI Comm Error
Communication error with
the processing unit for over 5
seconds.
Automatically reboot within a
minute.
P321
Grid Conn Fault
Incorrect power grid connection
has detected.
Contact service center.