We have lived in our house since 2003, and we have a HRM Wallstar Boiler. The house/boiler were both new. Everything was fine for about 4 years, then we noticed that sometimes the heating didn't click on when it was supposed to do, it only happened now and again. Of course it started happening more frequently, so we asked the plumber who usually came out to service our boiler to have a look. After several visits, all of which we were charged for, the boiler still doesn't work properly and rarely comes on on its own. We have to go outside and manually override by pressing the button. Sometimes you have to do this 30-40 times before the heating clicks on. Sometimes it will only stay on for half an hour, sometimes it stays on longer. Mid-winter it is awful coming home to a cold house, and having to stand outside in the cold for up to 15 minutes trying to override the system. Has anybody got any ideas?