Why does my GastroCH4ECK have a red cross, a pink circle saying 'PUR03 (2)' and have a retry symbol?

CH4 SensorCheck Sum/End Char Error On GastroCH4ECK

Try pressing the retry button. If the error occurs more than 3 times, please restart the unit. If failure persists then please contact your local distributor for more advice.

If the problem persists or has not been resolved by the information provided above, please contact your local distributor for more information. Find out who your local distributor is from our website here.