To force the black pin of your Smart Radiator Thermostat to retract, restart the device.

The restart is successful when you see ‘Hi’ on the display of the device. For the Smart Radiator Thermostat Basic, the dashes next to the temperature markers on the display will turn on and off. For both devices, the black pin will retract.

When mounting your Smart Radiator Thermostat again, it’ll start to calibrate to find the valves’ open and closed position.