How to mend Vaillant Ecotec Pro 28 F.75

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my boiler will no work?

Advice?

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Hot water comes and goes!?

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No hot water, intermittent when air temp drops?

How do I fix f22 error on my Vaillent Ecotec Plus boiler?

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how do I rectify the fault as detailed below?

Vaillant 828E - no hot water?