how do I rectify the fault as detailed below?
Vaillant igniting issue ( domestic ) not CH?
Valiant thermostat , BMU-Err ?
how to fix water pressure its down at bottom of grey part?
Vaillant vcw gb242 eh central heating problem?
vaillant ecoTEC plus boiler fault code - how to fix?
Vaillant ecotec plus 630?
Boiler over pressure on the hot-water side?
Problem with the pressure in combi boiler?
Vailliant turbo max plus 824e?
Vaillant Thermocompact Fault?
No hot water, intermittent when air temp drops?
How do I fix f22 error on my Vaillent Ecotec Plus boiler?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
my boiler will no work?