myson economist boiler?

hi could you help me ...my hot water is permenantly hot?? how do i get it to cool ive switched everything off no joy including the thermostat down to "off" position i used to have tepid water and so messed with the boiler since then its been giving BOILING hot water all the time any suggestions is there a myson dealership or someone that could advise what to do??

philp rogers
April 2008