bosch e15 leak base

I have a Siemens dishwasher which I believe is similar to a lot of other brand (Bosch etc) It is currently leaking from underneath and quite rapidly. It runs a cycle for up to 5 minutes before it cuts out with the e15 error as the float switch has triggered. I have taken it apart as much as...

Our Bosch dishwasher is about 4-5 years old, and recently cut out with the E15 error/pump running continuously. There was water in the base + float, so I drained it and ran another cycle watching with a torch. A few minutes after starting, I observed a trickle of water running from a vent hole...