How to mend ... Vaillant Water Bar

my vaillant boiler is saying a code com on it ?

Vaillant 828E - no hot water?

Vaillant igniting issue ( domestic ) not CH?

Vaillant Thermocompact Fault?

Vaillant ecotec 937?

Vaillant ecotec 831 plus?

Vaillant ecotec plus 630?

Vaillant vcw gb242 eh central heating problem?

Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?

vaillant vcw gb 282gh?

Hot water supply?

Vaillant eco plus 531 boiler?

What does f.25 mean?

resetting thermostatat?

Vaillant Ecotech Plus 831 F22 fault?

Water dripping from opening at top of pump?

Vaillant F22 fault?

vaillant ecoTEC plus boiler fault code - how to fix?

How many factors causes f22 fault?

No hot water, intermittent when air temp drops?

Why is heating on at night?

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

no heating water?

how do I rectify the fault as detailed below?

Vaillant 630 error f 85?

Hot water comes and goes!?

my boiler will no work?

Valiant thermostat , BMU-Err ?

How can I fix my Vaillant turbomax 828 ??

Vaillant condensing boiler ecoTEC plus?