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Mend Vaillant ecoTEC pro Heating Hot Water Intermittent

hi i have eco tec pro .hot water goes on off every time ?

hi when i turn the hot water on hot water come but stops then i have to stop the tap for a wile then turn it on again .what could be the reasion ?

harjas
December 2012
VaillantVaillant ecoTEC proHeating, Home Heating SystemsHeating Hot Water Intermittent
HW flow sensor.

SD
December 2012

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Vaillant ecoTEC Pro: Hot Water Issues