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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...

This error code appears daily when the shower is in use in main bathroom (and abruptly stops hot water) It works fine if I use shower in second (ensuite) bathroom. On the website it says "E03: Overheated boiler". (It might be true as the water in main bathroom comes out real hot! Even if I...