How to mend Vaillant Ecotec Plus Vu 22

my boiler will no work?

how do I vent the heat exchanger?

Vaillant Ecotech Plus 831 F22 fault?

Boiler over pressure on the hot-water side?

Hot water comes and goes!?

No hot water, intermittent when air temp drops?

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Vaillant F22 fault?

can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?

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how to fix water pressure its down at bottom of grey part?

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

vaillant ecoTEC plus boiler fault code - how to fix?

Why is heating on at night?

What does f.25 mean?

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how do I rectify the fault as detailed below?

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Advice?

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