Hot water from Boiler only when the taps are fully open – how to fix?

Dear boiler-knowledgeable-people of Reddit, help out a complete noob here please.

I have an ideal combi boiler.

For hot water the boiler only ‘triggers’ when the taps are at maximum flow. Heating is fine.

Is this something I can diagnose / fix without getting a boiler engineer in?

Thank you 🙏

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