How do I fix f22 error on my Vaillent Ecotec Plus boiler?
No hot water, intermittent when air temp drops?
Vaillant eco plus 531 boiler?
Vaillant 828E - no hot water?
Vaillant igniting issue ( domestic ) not CH?
Valiant thermostat , BMU-Err ?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Problem with the pressure in combi boiler?
how do I rectify the fault as detailed below?