I use the smart grid control to override the ecodan controls when i get solar gain. I also use it to automatically turn the heat pump off during Demand Flexiibilty periods with Octopus.
I have a Shelly 1 powered from the ecodan 230V supply and providing a volt-free open/close switch across the FPC 6 terninals.
Im controlling the Shelly with somd Node Red logic running on my Emonpi.
It seems to work well although it does leave the circ pumps running.
Rachel