Why does my GastroCH4ECK have a red cross, pink circle and retry button?

CH4 Sensor Reading Error On GastroCH4ECK

Firstly, verify that no gas is flowing through the device. If there was gas being used, please wait 5 minutes before attempting a new test and then press the retry button. If the error occurs more than 3 times, please restart the unit. If failure persists then contact Bedfont or their distributor for support.

If the problem persists or has not been resolved by the information provided above, please contact Bedfont or your local distributor for more advice.