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takes time for hot water to flow then stops with cold water?

vailant boiler comes on when i open my hot water tap, but takes time for hot water to flow then after a minute cold water starts. I switch the tap off and re-open it and then it would work why is this? combi boiler over 10 years old.

celen
March 2011
VaillantVaillant EcoTECBathroom Appliances, Baths and ShowersBoiler Combi Vaillant

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Topic

Vaillant EcoTEC: Hot Water Issues - Fixes