Hi, I hope someone can throw some light on this: our central heating is working but the radiators are not getting hot enough. The boiler (3 years old) is turned to maximum and the thermostat is turned up to 23 degrees. The heating is fine until the thermostat reaches 17 degrees, the rads then turn off and it is very cold in the house! When the thermostat registers 16 degrees it kicks in again but turns off once again when it reaches 17. We are therefore only obtaining a small amount of heat. Does anyone know if theres anything we can do to try to rectify this before calling out a heating engineer? Thanks!