Does the Lunar Premier 415 taps have micro switches?
If you have taps operated by pressure sensitive switching then you will have a pressure sensitive switch located with an inlet socket or fitted in a supply pipe. It can also be built into the pump. If you do not have one then it is more than likely that your taps are operated by a micro switch. From memory, I think our Lunar Zenith Six that we used to own had taps with micro switches.