It reports the average of the two zone/room zigbee and zwave temp sensors.
The test is to detect if one of the two temp sensors is misbehaving by detecting if one of the temp sensors is x degrees above or below the average temp as recorded by the Thermostat Controller.
What about zigbee temp - z-wave temp = x, if x > 2
Ie if you have a roge sensor the gap between the 2 sensors will be large. The thermostat control valve is irrelevant as it will always be in the middle
Actually identified an issue with just using the devices and not the Thermostat Controller app Temp.
Not all devices have a temp offset on them - this is circumvented by using the Thermostat Controller App offset option.
Checking against just the actual devices may cause an issue, I need to spend more time on it.
This is all part of using one HE for managing hot water and central heating zones/rooms and using another HE to provide oversight and validity checking of the actions of the Heating HE.
The Oversight HE can push an orderly reboot and power off for the Heating HE if required using a Hue Power Plug.
I can Hard reboot both from the Hue App if absolutely required and I am remote and the HEs are unresponsive.