Viessmann combi starts when cold, mixer, tap is opened

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Plumdim

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Recently had a Viessmann Vitodens combi boiler installed, quite often when the adjacent cold mixer tap is opened the boiler starts for a few seconds!
Can anyone tell me what is causing this?
And how to cure?
 
Needs a non return valve fitting on the cold to the boiler and a shock arrestor
 
Plumdim said:
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!)
Click to expand...

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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