how do I rectify the fault as detailed below?
Vaillant Thermocompact Fault?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Vaillant ecotec 831 plus?
Vaillant ecomax 828/2 e water pressure sensor?
how to fix water pressure its down at bottom of grey part?
Why is heating on at night?
Vaillant eco plus 531 boiler?
vaillant ecoTEC plus boiler fault code - how to fix?
No hot water, intermittent when air temp drops?
Problem with the pressure in combi boiler?
Valiant thermostat , BMU-Err ?