Whilst staying on a campsite in Switzerland we woke up and I turned on the water boiler. After turning it off I noticed that the water pump wats running continuously. On inspection it seemed that the Truma combo boiler was leaking. After much consternation and internet searching I investigated further by moving water pipes out of the way and found that it was in fact a leaking pie at the junction with the dump valve. It is now fixed and what could have cost £1800 for a new boiler has cost us €1.80 for a new jubilee clip. So relieved and we are able to continue with our holiday.