How can I fix my Vaillant turbomax 828 ??
how do I rectify the fault as detailed below?
Vaillant condensing boiler ecoTEC plus?
Vaillant Thermocompact Fault?
my vaillant boiler is saying a code com on it ?
resetting thermostatat?
Hot water comes and goes!?
Vaillant ecotec 937?
how to fix water pressure its down at bottom of grey part?