how do I rectify the fault as detailed below?
Vaillant Ecotech Plus 831 F22 fault?
Vaillant condensing boiler ecoTEC plus?
How many factors causes f22 fault?
my boiler will no work?
Water dripping from opening at top of pump?
vaillant ecoTEC plus boiler fault code - how to fix?
Boiler over pressure on the hot-water side?
resetting thermostatat?
no heating water?
No hot water, intermittent when air temp drops?
how to fix water pressure its down at bottom of grey part?