As an update to the above, Martin sent me additional details about the device and I was able to determine what’s happening.
-
The device implements custom Homey capabilities called
operating_mode
andfan_speed
. -
The official Homey capability for controlling the Thermostat Mode is called
thermostat_mode
and is not implemented on this device which is why the ‘Adjust’ option doesn’t show up.
That being said, Homey users can still interact with custom capabilities as noted here: