I have 2 Seplos 48v 50a bms. Both when connected read all zeroes on the LCD display. The cell voltage is completely blank. The temps are all -230C or so. Tried two boards and 2 LCDs, same result. Light blinks in blink3 mode (0.5, 1.5 second pulse) which means warning. Soc lights show 2/4. Please...