my vaillant boiler is saying a code com on it ?
Vaillant igniting issue ( domestic ) not CH?
Hot water comes and goes!?
Vaillant 828E - no hot water?
Why is heating on at night?
Boiler over pressure on the hot-water side?
Vaillant ecomax 828/2 e water pressure sensor?
how to fix water pressure its down at bottom of grey part?
What does f.25 mean?
vaillant ecoTEC plus boiler fault code - how to fix?
Vaillant Thermocompact Fault?
Vaillant vcw gb242 eh central heating problem?