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Mend Vaillant ecoplus 24 Boiler Central Heating

my hot water is only luke warm?

I have a vaillant ecoplus 24 boiler which is just under 3 years old, with the central heating on the water is warming up ok, without the heating on the water is only luke warm. What could be wrong? Can you help me please.
Thanks.

Lorraine
April 2011
VaillantVaillant ecoplus 24Heating, Home Heating SystemsBoiler Central Heating Vaillant

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