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??? OK you got me, I was lying about the water temperature and the control position. Your mystical powers of remote temperature sensing are incredible.

On the faulty system it doesn't seem to matter where you set the dial, you get water at 65C. The only position where the water isn't at scalding temperature is 0 where you get cold water. Even if I reset the system whenever I change the setting, it still behaves the same. I suspect that of the...

The diverter valve was changed out 18 months ago as well as the flow sensor. Are you suggesting that the plate heat exchanger is part-blocked on the dhw side or the recirculating side? We have very soft water in this region so it's unlikely to be limescale.

I can't see how the pre-heat cycle is part of this problem. The problem is that the hot water runs at maximum temperature (and continues at maximum as long as water is flowing) whatever position the temperature control is set to. As for resetting, the boiler has been on and off several times...

If you set the hot water temperature to zero on the front panel control the hot water system never comes on. If you turn the control to the very minimum setting that will make the hot water circuit active, the burner lights and the hot water output temperature quickly rises to 65C (maximum). It...