Might need to check the continuity and or voltage on the harness/plug. There’ll be a status code for whilst you’re running hot water, even if it’s just S.30. Also is the hot water temp set?
The lower flow sensor is for the domestic hot water, the upper sensor (that has a completely different appearance) is for the primary water flow. If that sensor was faulty the heating wouldn't work.
Have you got the old parts?
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