how do I rectify the fault as detailed below?
my vaillant boiler is saying a code com on it ?
Valiant thermostat , BMU-Err ?
Problem with the pressure in combi boiler?
Vailliant turbo max plus 824e?
vaillant ecoTEC plus boiler fault code - how to fix?
Hot water comes and goes!?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Vaillant Ecotech Plus 831 F22 fault?
No hot water, intermittent when air temp drops?
Vaillant 828E - no hot water?
How do I fix f22 error on my Vaillent Ecotec Plus boiler?
my boiler will no work?
Vaillant eco plus 531 boiler?
how to fix water pressure its down at bottom of grey part?