Combi boiler problem.

mickdeer's Avatar (by Gravatar) by mickdeer in  Plumbing » Water » Hot Water 

I have a Ariston Combi Boiler.
My problem is that the central heating cuts out when I turn on a cold tap and will not fire up again until I turn off the tap.
This has been happening since I replaced my bath with a shower unit.
Any help please as to why this is happening!
Many thanks,

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