Why is my Gastro+ showing a warning sign with a cylinder?
This indicates that the device needs calibrating, you can find instruction of how to calibrate the device in the manual. This could also show if the device has been reset, the device will still need calibrating.
On rare occasions, the firmware could have been corrupted due to a bug, reprogram the device via the Bedfont Monitor Recovery Tool.
If the calibration reminder has been turned on, disable it via the secret menu.
If the problem persists or has not been resolved by the information provided above, please contact Bedfont or your local distributor for more advice.