how do I rectify the fault as detailed below?
How can I fix my Vailant Eco tec plus 438?
Valiant thermostat , BMU-Err ?
Vaillant condensing boiler ecoTEC plus?
no heating water?
Vaillant vcw gb242 eh central heating problem?
vaillant ecoTEC plus boiler fault code - how to fix?
Vaillant 828E - no hot water?
Vaillant ecotec plus 630?
Vaillant igniting issue ( domestic ) not CH?
Vaillant eco plus 531 boiler?
Hot water comes and goes!?
No hot water, intermittent when air temp drops?
how to fix water pressure its down at bottom of grey part?
Problem with the pressure in combi boiler?
my boiler will no work?
How do I fix f22 error on my Vaillent Ecotec Plus boiler?
resetting thermostatat?
Vaillant Ecotech Plus 831 F22 fault?
my vaillant boiler is saying a code com on it ?
Boiler over pressure on the hot-water side?