Hi Christian,
Yes , I agree , KNX does work but I could never afford it!
I am conscious that I have failed to write about my problems with sufficient clarity.
To Simply matters I have produced the following photographs of the front screen of my Samsung.
Front Screen Without Weather compensation, set using 2091/2092 OFF.
The Water Temperature is set 38 C and the HP is delivering 37.8 C.
The HP is working without Weather Compensation.
Front Screen With Weather compensation, set using 2091 Option 4 .
With the Water Law offset Thermostat set to 1.2 C the Water Temperature is set to 42.4 C.
The HP stays in this condition oscillating about 42.3 C.
Weather Compensation is working
Front Screen With Weather compensation AT peak operating point, set using 2091 Option 4 .
The Samsung is stable operating point at 42.4 C.
Samsung Air Temperature Sensor. The probable Culprit.
The Probable Culprit , the Air Temperature Sensor!
Hopefully, Photographs are worth a thousand words!
Many thanks
ian