Error flag 1 on connecting the board to a battery pack

[Ananyaaynana]

Description:
When the BMS is brought up an error flag 1 is always present. Error flag 1 indicated cell Undervoltage. None of the cells are below the value of 2.5V for LFP cell. Here is a picture on the thingset app:

Once I run the west espressif monitor the error flag is cleared like in this picture:

Double-checked the connections and it looked fine. This happens every time the BMS is brought up.

[martinjaeger]

I can see that the last cell measurement shows 0.000 at the bottom of your screenshot. How many cells do you have connected? And how does your used-cell-channels parameter in Devicetree look like?

[Ananyaaynana]

15 cells are connected in series. used-cell-channels is 0xFFFF.

[martinjaeger]

I have checked here (with 4 cells connected) and I cannot reproduce the error. In my case all cells from 5 to 16 show 0.0V, but the number of cells seems to be detected correctly.