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Mend Vaillant ecoTEC Boiler Heating Combi

Cannot turn heating off?

I have just moved into a house with a Vaillient combi boiler. I cannot turn the heating off by any means, I have tried holiday mode, summer mode, turning thermostat down as far as it will go.

Also the hot water supply is very poor.

Any ideas please.

Many thanks

Adam Smith
March 2010

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