Pylontech US2000C, Operation Manual

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then try turn on the single module, without any cable connected. If no alarm,
then it is reverse connection of cables. Switch off the module and contact
your local distributor.
j)
MOSFAIL.
Solution: Power off all battery and inverters. Disconnect breaker. Check the
cable connection and disconnect all power cables. Check the power port
damaged or not.
then try turn on the single module, without any cable connected. If still
buzzer rings. Then it is mosfail. Switch off the module and contact your local
distributor.
6)
After switch On, the module turns on directly
k)
BMS failure.
Solution
：
Switch off the module and contact your local distributor.
Excluding the points above, if the faulty is still cannot be located, turn off
battery and repair.