I had a new boiler (glowworm ultracom 24 hx1) fitted with a new pump, hot water cylinder and 2 2 way valves fitted just over a year ago. I noticed around christmas that even though the hot water and heating is off my pump keeps running and my boiler keeps firing up. The valves are working properly as is the downstairs thermostat. The pump still runs all the time. the boiler keeps firing up to 70c. The radiators stay cold and the cylinder is cold when the programmer is turned off. I have changed the programmer but this hasn't worked. my gas usage has gone through the roof. Can anybody help me. Thanks. Dave