You have done correctly by turning on the eco mode to shut off the dhw preheat, when it does run - what is on the display?
The indicator shows the water temp which drops one or two degrees
Ater removing the new IT500 Salus receiver I have re-installed the original Worcester receiver and then all is back to normal.
salus could give me no explanation as to why the boiler was running and only daid that their "kit was spot on and it was my boiler" which is only 18 months old.
We were looking for remote control basically for swithing on when away from home to arrive home to a warm house.