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Vaillant ECOTEC COMBI headache?

Ive had fitted a brand ne Vaillant Ecotec combi, hot water works fine heating doesnt, it cycles on and off for 2 seconds, but when the cold supply is turned off to the boiler and the boiler reset, heating works ......and no hot water as supply closed

any ideas before i call in Vaillant

Raj
February 2007

Vaillant Vaillant ECOTEC COMBI Heating, Home Heating Systems Vaillant Combi Boiler Heating

sound like your divertor valve sticking

gasmanuk
February 2007

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Vaillant Ecotec Combi Heating Issue - Help!