Baumatic BDW13 (E4) Fault?

I've read your answers to this problem and carried them out to the letter. I have even gone to the extent of removing the float switch to clean it. Initially the E4 fault disappears but, there are two small plastic pipes that seem to come from what appears to be an overflow outlet, on the same side as but just behind the salt filler point. One of these pipes drips water, not constantly but, enough to activate the float switch re-triggering the E4 fault. Any ideas please.