my vaillant boiler is saying a code com on it ?
how do I rectify the fault as detailed below?
Hot water comes and goes!?
Vaillant igniting issue ( domestic ) not CH?
Water dripping from opening at top of pump?
What does f.25 mean?
Vaillant ecomax 828/2 e water pressure sensor?
How many factors causes f22 fault?
Vaillant ecotec plus 630?