After years of working fine, this heating season something constantly started triggering my boiler and the cause was not showing up either in HA or Tado app. No device would show heat demand, but my wall thermostat kept clicking on, triggering the boiler and heating the house. This chart shows heating demand on top for all my tado devices, and gas usage below:
The tado app essentially shows the same.
After a lot of searching I found something weird may begin to explain it. This is bedroom TRV target temperature:
The " curved" parts are when heating is supposed to be OFF, and shown as OFF in the tado app, and the values are exactly current temperature as measured by that very tado TRV.
At first I thought this was just a graphing error, showing current temp when there is no target temp (because heating is OFF), but this seems to explain what Ive seen perfectly: The bedroom TRV is not mounted to a radiator. I use it basically like a wall thermostat (there is another zigbee TRV on the radiator) . So when the living room requested a little heat, the bedroom warmed up as well. And if its true that for some weird reason the target temp is the current temp, thats going to keep going up and keep (silently) triggering the boiler.
Ive now disconnected the bedroom trv from the " zone controller" so it can no longer trigger the boiler and so far that seems to have solved the problem. Except of course, now I can no longer start the boiler and heat up my house if the bedroom starts freezing.
Ive been talking to Tado, I think an AI chatbot and Im not getting anything useful. Anyone have an idea whats going on?