Vehicle battery not connected - sargent

[cavester]

Hi,

I have 2023 T6.1 using a Sargent EC176.

Previously I could select either leisure or vehicle battery as power source. However, when I try to select the vehicle battery as source now it says "vehicle battery not connected". I have tried changing the 20a fuse labeled vehicle battery on the Sargent unit but that didn't make any difference.

Is there another fuse I am missing that could be the issue between the vehicle battery and the Sargent?

Thanks.