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The boiler will not turn off .

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MetMan

The boiler (480k, serviced every year) will not turn off at the end of the 3rd timed cycle each day, even though the green 'on' light is out. This happens when set to 'heat and hot water'. Switching to 'hot water' only, turns it off. Engineer called three times and has replaced the control panel and the mid position actuator, to no effect. The cooker side is fine.
 

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