worcester greenstar 28i junior hot water issues

Joined
9 Nov 2016
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Hey guys,

Having issues with a worcester 28i junior combi. Heating is fine but when the hot water is in use it stays hot for around 30 seconds to a minute than runs cold. The boiler does not lock out. If the taps is then closed and re opens the same process happens. Hot for a short while than cold again.

I have thought it could be down to two things either the pump or the plated heat exchanger.
Could anyone offer any advice as it would be greatly appreciated?
 
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