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Mend Vaillant Boiler Flow Rate

whats wrong with my vailant boiler?

when opening the hot tap to run it takes time to flow hot water and then my boiler stops and cold water runs. i then turn the tap off and re-open it and it works. why is this?

YILDIZ
March 2011
VaillantBathroom Appliances, Baths and ShowersVaillant Boiler Flow Rate

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Topic

Vaillant Boiler Slow Hot Water & Stops - Help