Daikin Low Water Leaving Temperature

[mandraki]

I wonder if someone here can help

We bought a house which has a slightly ageing Daikin EKHBRD-ACV1

We've had some renovations done and replaced the radiators downstairs with UFH controlled by a heatmiser wired system. This is controlled by wireless thermostats - which work fine - just opening/ closing the manifolds on demand.
There is a wireless demand switch back to the ASHP
Upstairs we have Tado TRVs which communicate to a Tado wireless receiver

Both the UFH and the Tado system seem to work properly - the LEDs all come on when they should

But they're not getting hot water from the ASHP. There is water flowing according the UFH manifold flow valves

The problem seems to be that whatever leaving temperature I set on the Daikin controller, the leaving temperature doesn't exceed about 30C

Hot water is fine

What could be causing the low leaving temperature?

(If this all sounds a little heath robinson, it is - the builder who installed most of it didn't get a heating engineer in - which was one of the many reasons we parted ways)

Thank you