how do I rectify the fault as detailed below?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Valiant thermostat , BMU-Err ?
Vaillant ecotec 831 plus?
No hot water, intermittent when air temp drops?
how do I vent the heat exchanger?
Vaillant Thermocompact Fault?
how to fix water pressure its down at bottom of grey part?
Vaillant vcw gb242 eh central heating problem?
Hot water comes and goes!?
Vaillant ecotec plus 630?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Vaillant condensing boiler ecoTEC plus?
my boiler will no work?
my vaillant boiler is saying a code com on it ?