I bought/moved into a new build in October 2015. Just recently, my heating system has gone crazy. Boiler not turning off when it should and constantly running (Unless physically switched of on the wall), causing the central heating to be on constantly. Also the boiler isn' feeding the hot water tank meaning no hot water. Also the doorbell has stopped working. The building company said the warranty expired in 2017 so **** off. I was under the impression there was a 10 year warranty and things like the heating system should be covered?