11
Troubleshooting
31
11.
Troubleshooting
11.1.
Battery System Behavior under Fault Conditions
Blue light flashing
If blue LED flashes, and the interval time between two flashes is 1 second, which means an error
happened. (When the system is initiating, the white light and blue light flash alternatively every 0.5s.
That is not an error.)
The detailed designation for errors of each LED lights could be read in 11.2.
Except the LED light, we can also get the faulty messages of the battery through the remote server
and Be Connect Plus. Information read through that could help a lot t to identify the issues. So
highly recommend to connect the battery system to the Internet or download and use Be Connect
Plus.
WLAN is not available
Contact with BYD local after-sales service.
The battery system is not able to be turned on.
Check the system has been constructed according to the Battery-Box Premium Compatible Inverter
List. If the problem still cannot be solved, contact with BYD local after-sales service within 48 hours.
Damage to the battery system due to under voltages
• If the battery system doesn't start at all, please contact BYD local after-sales service within 48
hours. Otherwise, the battery could be permanently damaged.
Blue LED is flashing one time.
System initiating failed
Blue LED is flashing two times.
Address distribution failed
Blue LED is flashing three times.
Precharge failed
Blue LED is flashing for four times.
BMS failure
Blue LED is flashing five times.
BMS and BMU communication failed
Blue LED is flashing six times.
Communication with an inverter failed
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Configuration not correct
Blue LED is flashing seven times.
The battery
system
cannot be turned off.
Contact with BYD local after-sales service.
BMU cannot be powered
on.
Contact with BYD local after-sales service.
11.2.
LED Light Designation for Errors
LED light on BMU
