of the bypassed module. If
not, further bypass the next
LED off module and repeat the
process.
3. If problem remain, contact
Pylontech service engineer.
BMS
Internal
bus error
(Bit9)
CMU internal error
or I2C issue
1. Restart
2. Change the current
measurement board
3. Change the CMU or BMS.
4.If problem remain, contact
Pylontech service engineer.
Self-test
volt error
(Bit10)
Battery cell
voltage
measurement
mismatch with
DCBUS voltage
measurement
1.Restart
2.Check the connectivity and
reliability of the power and
comm. cable by reconnection.
3. Swap the current
measurement board or BMS
4.If problem remain, contact
Pylontech service engineer.
Safety
check
failure
(Bit11)
1.Restart
2.If problem remain, contact
Pylontech service engineer.
Command by
external device
via dry contactor
Command by external device,
not an error actively report
by Battery system.
Self-test
module
detecting
amount
error
(Bit14)
contact Pylontech service
engineer.
Self-test
module
coulomb
error
(Bit15)
contact Pylontech service
engineer.
Self-test
module
Initial
Error
(Bit16)
1. Restart
2.If problem remain, contact
Pylontech service engineer.
Communicat
ion error
between
master and
slave BMS
(Bit17)
1. Battery
string(s)
over-discharged
2. BMS CMU error
1. Check whether the battery
string(s) has been
overdischarged or not via
multimeter.
2. Check the comm. cables
between master and slave BMS,
make sure the cable is 8PIN
pin – pin CAT5 Ethernet cable.