my vaillant boiler is saying a code com on it ?
how do I rectify the fault as detailed below?
how to fix water pressure its down at bottom of grey part?
Problem with the pressure in combi boiler?
Vaillant condensing boiler ecoTEC plus?
No hot water, intermittent when air temp drops?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Vaillant ecotec plus 630?
Vaillant 828E - no hot water?
Vaillant Thermocompact Fault?
How do I fix f22 error on my Vaillent Ecotec Plus boiler?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?