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Vaillant Thermocompact Fault?
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my vaillant boiler is saying a code com on it ?
how do I vent the heat exchanger?
how do I rectify the fault as detailed below?
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vaillant ecoTEC plus boiler fault code - how to fix?
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Problem with the pressure in combi boiler?
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No hot water, intermittent when air temp drops?
Advice?
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