Thanks,
I disconnected the hose and syringed some water up it to try clear it.
Started another cycle – it immediately filled with water like the similarly coloured one on the other side. I think there might be some more debris further up the hose but hopefully not enough to block it. It didn’t leak from the hose connection before so I assume if it is this it causes a blockage somewhere further back in the system.
Pics: https://drive.google.com/drive/folde…k9?usp=sharing
Running another cycle now – hoping for no water build up.
Any Mods there can you remove my image upload restriction and I will put images on the post instead of externally to help future viewers.