Newbie problems controlling CT50 thermostat

[apella12 (Bob Eckhoff)]

This is not an area I’m particularly knowledgeable but have this for my setpoints

        - component: oh-stepper-card
          config:
            footer: =items.UpstairsThermostat21_SensorTemperature.state
            item: UpstairsThermostat21_SetpointHeating
            max: 70
            min: 62
            step: 1
            title: Upstairs Setpoint Heat

Edit: it looks like this;