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Home heating valiant Eco tech 831?

Every time I turn my heating up over 60 the boiler displays flashing light 2.8 bars what is causing this and how an l cure it

Vicky
November 2013
ValiantValiant Eco tech 831Heating, Home Heating SystemsBoiler Heating Valiant

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Valiant EcoTech 831 Boiler Error - Flashing 2.8 Bar