Troubleshooting; Error Codes And Messages; Pcs Error Codes - LG ESS Home 10 Installation Manual

Error Codes and Messages

PCS Error Codes

Do not leave the ESS in the Fault standby state for a long time because of the battery discharge
may occur during the long standby state.
If the battery fault occurs immediately after starting PCS it means Battery failure. Check the
battery SOC also voltage and fault information, and turn off the power of the ESS until service
action is taken.
If the battery SOC is low the battery may charge from the grid for self-protection. (Emergency
Charging) This function is to prevent shutdown of the ESS, deep discharge and failure of the
Battery. An Emergency Charge is not an ESS fault.
Code Message
P400 AC MisWiring Fault
P401 Meter Comm Fault
P402 BMS Fault
P403 BMS Comm Fault
P404 PMS Comm Fault
SDSP Comm Fault
P406 SDSP Fault
P407 Fan Fault
P408 Grid Relay Fault
P409 PV Over Voltage Fault
Description
Incorrect wiring grid connection
has detected
Communication error with the
energy meter
The BMS fault message from
battery.
Communication error with the
connected battery for over 10
seconds.
Communication error on PCS
system
Communication error with the
seconds
times
times
Fault occurs 3 times in the same
relay
Voltage level of the PV is higher
than the limitation and the state
is maintained for more than 10
minutes

Troubleshooting

Solution
Contact service center
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