How to mend Vaillant Ecotec Plus 624 R1

Problem with the pressure in combi boiler?

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Vaillant 828E - no hot water?

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how do I rectify the fault as detailed below?

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Advice?

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No hot water, intermittent when air temp drops?

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Hot water comes and goes!?

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

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vaillant ecoTEC plus boiler fault code - how to fix?

Why is heating on at night?