When the CORE sensor calculates, it is trained to know realistic human temperatures. Within this range, sometimes the temperature shown may be hotter or cooler than we expected, and we have described this is a little more detail.

We have also identified some cases where the CORE calculates impossible values and let you know how to identify this and the steps we recommend.


If you are getting high constant readings - you could have a malfunction sensor. If you believe this is happening with your CORE sensor - please contact us.


Good Data - but unexpected
The CORE Body Temperature Monitoring Sensor is calibrated to read your energy transfer and with the algorithm show your core body temperature with an extremely high level of accuracy. At times you may feel cool and the CORE sensor shows that you are actually hotter and vice versa - this is entirely normal as our perception for this metric can vary.


Often outside weather and even your skin temperature (feeling cold or hot) can impact the perception which can naturally vary from the core body temperature.

Over time, as the awareness for your own temperature behaviour develops, you will also be able to better judge how different activities of different physical intensity will impact your core body temperature.

Bad Data - Impossible values / switching High and Low

We identified an issue with some CORE sensors. Typically the sensor works correctly and then after some use may start to show impossibly high and impossibly low values - for example the CORE sensor may show 43ºC and or show 31ºC.

Although there can be a shift in the values if the CORE switches between the 24/7 mode and the sport mode (when it identifies a pairs heart rate monitor and then needs to recalculate), this may only be a small shift and the data would be realistic.

In the case of readings with impossibly high and low values where it suddenly shifts, this is due to a production issue which affected a small number of CORE sensors and specifically in which a small component within the sensor dislodges and causes this flaw.

If you are affected by this - please contact us using the chat function on our website and briefly describe the issue. In the cases in which we identify that you are not affected, often a reset can resolve connection issues. Otherwise it is confirmed that you are affected, we will seek to swiftly rectify this and swap your CORE sensor.

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