Changes won’t display
When playing around with the new interface (UI7), I stumbled across the fact that setpoints of the Horstmann HRT4-ZW (better known as SRT321), can’t be set anymore from the thermostat itself. At least, the values won’t display.
Thermostat is turned OFF
After some searching, it seems that the setpoints are correctly set, but that the thermostat isn’t turned on (as indicated by the button OFF). If this is the case for you – the button OFF is grayed out – you can’t activate it by pressing another button, as the thermostat doesn’t support these commands.
The solution is pretty straightforward, as we need to activate the device and turn heating on. You can do this by defining the following variable “ModeStatus”.
Go to your device and select “Advanced”. Scroll down to the bottom and fill in the following values:
New service: urn:upnp-org:serviceId:HVAC_UserOperatingMode1 New variable: ModeStatus New value: HeatOn
The result should look like the following image. Updates from spinning the wheel should be displayed with a small delay.