potterton promax problem

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got a strange problem with a potterton promax combi 28he plus boiler. even on hot water only, when running the hot water there is a banging noise from the boiler, and a corresponding needle movement on the pressure gauge. love to know what this is- can anyone point me in the right direction? cheers.
 
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This is very likely to be a blocked plate heat exchanger!

To diagnose would mean measuring the internal flow and return temperatures during hot water delivery.

Are you anywhere near to the Castle Balti?

Tony
 
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Not really a very big problem, at least not to me.

I usually charge £136 inclusive for diagnosing the fault, cleaning the plate heat exchanger and doing a basic service!

Tony
 
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Agile if it does it on heating and also on Hotwater surly it's a pump/ flow blockage not a plate issue?
 
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