how do I rectify the fault as detailed below?
my vaillant boiler is saying a code com on it ?
Valiant thermostat , BMU-Err ?
Vaillant condensing boiler ecoTEC plus?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
how to fix water pressure its down at bottom of grey part?
Vaillant igniting issue ( domestic ) not CH?
Vaillant Ecotech Plus 831 F22 fault?
Problem with the pressure in combi boiler?
No hot water, intermittent when air temp drops?
Vaillant ecomax 828/2 e water pressure sensor?
Boiler over pressure on the hot-water side?
How do I fix f22 error on my Vaillent Ecotec Plus boiler?
Vaillant ecotec 831 plus?
Vaillant F22 fault?