Discuss Problem with Vaillant eco tec boiler in the Central Heating Forum area at Plumbers Forums

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My 10 year old Vaillant Eco Tec Boiler pump/fan occasionally turns on for 10 secs when the cold water supply is turned off at the tap or toilet after use. If the tap is turned off slowly, it doesn't happen. Any suggestions please?
 
Needs a non return valve and a shock arrestor fitting as the shock wave (from shutting the tap) is triggering the flow switch
 
Sorry but just seen your reply and thanks for it and your interest. Where should these be fitted near the boiler or incoming supply? Thanks again

Near the boiler
 
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