keston c36 combi too hot water

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My Keston C36 combi boiler is acting up - the water's getting way too hot.

It's hitting around 90 degrees when in use. And then bounces back to 40s. The led indicator for DHW also turns ON/OFF while temperatures bounces. (PFA)
Any ideas what might be causing this or how I can fix it?

To add more context, it tried with taps in bathroom and kitchen, and it was same behaviour.

Thanks in advance for any tips or advice
 

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