how do I rectify the fault as detailed below?
Vaillant vcw gb242 eh central heating problem?
Why is heating on at night?
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?
Vaillant ecotec plus 630?
how to fix water pressure its down at bottom of grey part?
No hot water, intermittent when air temp drops?
Vaillant eco plus 531 boiler?