Recent content by MarkPG

I've already tried unplugging it but the boiler keeps on running. As for the sticking gas valve, I thought that but it works O.K when the power is on, since when I turn the thermostat down the gas shuts off, and the boiler cycles ok on its own. How does the valve return to its off position...

I have an ageing Thorn M Type boiler, what I have noticed is that the boiler seems to run OK but if I turn it off via the programmer (by moving the selector switch to off) whilst it is still lit the boiler continues to run until the water in the gravity fed system overheats and turns my loft...