Ok so it seems for some odd reason after re installing the bms i had a single cell voltage high level 2 error but My cells were all balanced at 3.56v and my settings were 3.65v for high cut off. The charge and discharge mosfet switches showed both on in the Bluetooth app but bms was not on. When i changed to 3.75v cell voltage high cut off the bms turned on. I have found also when i change some settings like cell voltage or temps the bms will turn off the mosfets but still show them as being turned on in the Bluetooth app. What works is to turn them off and oddly the bms then turns on and then it also turns the switches back on in the app?? I dont know why but it works. So on top of getting the correct method to activate it seems the bms when you change perimeters can disable the mosfets but show in the app that they are on and really confuse things. I found this after connecting the battery to a light so i could easily see what was happening. I suggest to the other user with over current issues to try cycling the mosfet switches to see if it turns back on regardless of if they say they are already on.
Just wanted to highlight that this was also an issue in my case. And this resolution helped me resolve the problem.
My setup is a 280Ah 4S LiFePo4 + Smart Daly BMS setup with MPPT solar charge controller and DC/DC charger + load from 12V devices and 230V inverter - typical campervan setup.
I noticed yesterday that I had a 0.3V difference between the B- and P- cables. Moreover, the MPPT indicated to me that the voltage on the battery jumped between 12.7V and 13.3V and that made me think. I believe the issues might have started after I configured the Cell High Volt Disconnect (which I set at 3.35V -> 13.4V in series) and Cell Low Volt Disconnect (set at 3.22V -> circa 12.9V).
Initially the issue highlighted itself with my inverter being disconnected and beeping when the cells voltage was approaching it's top high volt value. Otherwise I couldn't observe the issue. Only when I did some digging I found that the voltage on B- and P- got misaligned somehow.
My cells were top balanced, and I was sure I correctly connected all the cables to my BMS. I made sure that there is no load or charge in the circuit whatsover (except for what's available in the LiFePo4 battery pack) and proceeded to the BMS bluetooth app to disconnect the Charge & Discharge switches in the settings.
This switched off the BMS which I could observe by the P- voltage falling down to something like 1.1V and slowly decreasing towards 0V. Interesting thing was that somehow the Bluetooth app still worked fine.
I then, using the bluetooth app, bumped up my Cell High Volt Disconnect (making sure that Battery Sum Voltage High Disconnect matches too) from 3.35V to 3.60V. In all honesty I think that any higher value that's approximately 0.25V higher than the cell high volt disconnect would've done (my cell diff protect is set to 0.25V). Once this was done I went back into the settings and switched the Charge & Discharge protection controls to ON. I then connected the Load (LED strip).
The BMS switched back on and the B- and P- voltages matched. The MPPT solar charge controller also now showed the correct voltage of the battery pack.
I hope this helps those that experience similar issues.
Cheers!