how do I rectify the fault as detailed below?
Vaillant condensing boiler ecoTEC plus?
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No hot water, intermittent when air temp drops?
Hot water comes and goes!?
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Valiant thermostat , BMU-Err ?
Water dripping from opening at top of pump?
How can I fix my Vaillant turbomax 828 ??
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vaillant ecoTEC plus boiler fault code - how to fix?