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how do I rectify the fault as detailed below?
my vaillant boiler is saying a code com on it ?
my boiler will no work?
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Boiler over pressure on the hot-water side?
vaillant ecoTEC plus boiler fault code - how to fix?
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Vaillant Thermocompact Fault?
Hot water comes and goes!?
how do I vent the heat exchanger?
how to fix water pressure its down at bottom of grey part?
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