Vaillant Thermocompact Fault?
how do I rectify the fault as detailed below?
vaillant ecoTEC plus boiler fault code - how to fix?
No hot water, intermittent when air temp drops?
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Valiant thermostat , BMU-Err ?
my boiler will no work?
my vaillant boiler is saying a code com on it ?
Hot water comes and goes!?
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