CBE PC180 fresh water indicator

[Shoes]

Hello all,

I have been asked to fit a Pc180 control panel into a van and it's all working perfectly apart from the fresh water tank indicator is flashing. Is there a way to wire the 4 pin plug to indicate that the tank is full? The water supply is under the sink in a 13litre container and this isnt necessary

Thanks for your help

Sion