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Discuss Viessmann combi starts when cold, mixer, tap is opened in the USA area at PlumbersForums.net
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Needs a non return valve fitting on the cold to the boiler and a shock arrestor
Thank you Shaun for your reply and solution.
Might changing the tap from a mixer to two singles also cure the issue? {they are 45 years old!)
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No as the issue is when you shut the tap a shock wave goes back through the pipes to the boiler and moves the flow switch
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