Wireless Temperature Sensor or Smart Thermostat
You should replace the flat batteries from your Smart Thermostat or Wireless Temperature Sensor with three fresh AAA alkaline batteries (LR03).
Some Smart Thermostat models have a screw on the bottom edge. So you’ll need to use a screwdriver to open the device.
Smart Radiator Thermostat
The batteries you use for your Smart Radiator Thermostat depend on the hardware version of the device (you can find the device model near the pairing button on the device).
For VA01 Smart Radiator Thermostats:
two fresh AA alkaline batteries (LR6).
For VA02 Smart Radiator Thermostats (available since 2019):
two fresh AA alkaline batteries (LR6) or
two Panasonic Eneloop AA 1900 mAh NiMH rechargeable batteries (we do not recommend using any other type of rechargeable batteries).
Remove the batteries from the device and wait 10 seconds before putting them back, then close the battery compartment. Then wait 1 minute before you remount the device. This ensures the device will calibrate successfully.
Your VA02 Smart Radiator Thermostat will recognise whether you are using alkaline or rechargeable batteries automatically and adjust to the different discharge curves to send the low battery email at the correct time.
When replacing the batteries, please remember the following:
Your devices may not work and can even be damaged if their batteries are replaced with an incorrect battery type.
Do not mix battery types and do not mix old batteries with new ones in one device. Always replace all batteries at the same time.
For safety reasons, when replacing batteries of a wired Smart Thermostat, please make sure to turn the power supply to the heating system off before removing the front cover of the device.
When placing the new alkaline batteries into your device's battery slot, take care to align the positive (+) and negative (-) polarities correctly, as shown in the diagram inside the battery compartment.