How can I fix my boiler in which the hot water works but the central heatin?

is room stat turned up?is there a valve in airing cupboard with silver or coloured box on it? check lever on side has moved across ?if not motor has gone try to push lever across then lock it in slot at end. heating will come on all the time the boiler is running for hot water.when hw stat is satisfied then it will switch off,if this works you will definately require a heating engineer to change the motor

alan
November 2008