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how can i fix my ideal classic boiler?

i have to switch my central heating off at the mains it wont switch off with the clock or the thermosat i have changed the clock and pcb
paul marshall, October 2012
probably find the most likely cause of this is the actuator/diverter valve in your airing cupboard depending on whether its a y plan (1 actuator) or s plan (2 actuators) system.

STUBOW, October 2012