My boiler above is only 6 months old but now even when we turn the thermostat right down the heating does not go off and even when it did go off at night before this current problem, it then came back on in the early hours with the thermostat turned right down. Please help

Helen, April 2013

If it comes on when water is used than diverter valve letting by or if cannot turn of even water is not used than faulty micro switch on front section of diverter valve

k, April 2013