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Hot water only when heating radiators.

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Bp89

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Hello. I have a Worcester Greenstar 24 Ri boiler linked to a Megaflo cylinder. The boiler heats water for central heating but when I want hot water only the boiler does not fire up. I can get hot water when the central heating is on, but not ideal in the summer. The boiler is only 18 months old. I have attached images of possible problem areas. Help please.
 

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