how do I rectify the fault as detailed below?
Vaillant ecotec plus 630?
vaillant ecoTEC plus boiler fault code - how to fix?
How can I fix my Vaillant turbomax 828 ??
resetting thermostatat?
Vaillant condensing boiler ecoTEC plus?
Hot water comes and goes!?
Vaillant eco plus 531 boiler?
Vaillant igniting issue ( domestic ) not CH?
What does f.25 mean?
Vaillant vcw gb242 eh central heating problem?
Water dripping from opening at top of pump?
Vaillant Ecotech Plus 831 F22 fault?
How many factors causes f22 fault?
Vaillant Thermocompact Fault?