Have you solved this issue? I got it too…
Because I don’t keep my Water Boiler connected to the electricity 24/7, I get errors when the rest sensor is trying to connect with the boiler… I have added a scan_interval: 1576800000 and I made an automation which will only update the entity if the boiler it is on, but does not care, he will still scan it. I don’t understand how and why…
Anyone got this issue till now, with the rest integration?