Glow worn Betacom 30c hot water and central heating pressure spiking

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21 Nov 2019
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United Kingdom
Hi,
Hoping for some advice, i have a Glow worn Betacom 30c from around 2008 and it has been fine up until today. When either the hot water or the central heating is turned on the pressure spikes from 1.5b to 3b and then turns off. if you leave either turned on after 1minute it starts again. boiler fires up and the pressume does a little dance and shoots up to 3b and turns off again.

it doesn't give a fault code it just keeps doing this.

any ideas what it could be? diverter valve? 2nd heat exchanger
 
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