can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
resetting thermostatat?
Vaillant ecotec plus 630?
Valiant thermostat , BMU-Err ?
Vaillant 828E - no hot water?
Vaillant condensing boiler ecoTEC plus?
No hot water, intermittent when air temp drops?
Problem with the pressure in combi boiler?
Vaillant ecotec 831 plus?
vaillant ecoTEC plus boiler fault code - how to fix?
my boiler will no work?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Vaillant vcw gb242 eh central heating problem?
how do I rectify the fault as detailed below?
how do I vent the heat exchanger?