how do I rectify the fault as detailed below?
What does f.25 mean?
my vaillant boiler is saying a code com on it ?
Why is heating on at night?
Vaillant ecomax 828/2 e water pressure sensor?
Vaillant 828E - no hot water?
Vaillant vcw gb242 eh central heating problem?
Vaillant ecotec 831 plus?
Boiler over pressure on the hot-water side?
Hot water comes and goes!?
No hot water, intermittent when air temp drops?
vaillant ecoTEC plus boiler fault code - how to fix?
Vaillant Thermocompact Fault?
How many factors causes f22 fault?
Water dripping from opening at top of pump?