my vaillant boiler is saying a code com on it ?
how do I rectify the fault as detailed below?
How many factors causes f22 fault?
Water dripping from opening at top of pump?
vaillant ecoTEC plus boiler fault code - how to fix?
resetting thermostatat?
how to fix water pressure its down at bottom of grey part?
Vaillant F22 fault?
Vaillant eco plus 531 boiler?