Why does my ToxCO have a zero and a red cross?
Ensure that the vent hole is not blocked and that the mouthpieces are attached properly during tests.
Ensure that the test is performed in a well ventilated area and no alcohol based products, VOC's, aerosols or room sprays are used on or in the presence of the device as these contaminations will affect the sensor within the device.
If the sensor fails, you will need to get in touch with your distributor to arrange a sensor replacement or service.
If the problem persists or has not been resolved by the information provided above, please contact Bedfont or your local distributor for more advice.