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Professional Plumber Required Radiators on when heating on!?

Discuss Radiators on when heating on!? in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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I have a keston 25 boiler and a megaflo hot water tank.
When my hot water is on at the control unit/timer I have hot water and heating activated despite the heating being off at the control unit/timer...

I've checked the valves and the actuators in the airing cupboard (1 for heating and 1 for hot water) and both are working mechanically and electrically but still the heating comes on.

Any thoughts?

Sandy, Bedfordshire.

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