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1Zero point too low (disinfectant pollution – air the device 24 hours)
2Zero point too high (disinfectant pollution – air the device 24 hours)
4Sensor sensitivity too low (sensor must be exchanged)
8Sensor sensitivity too high (sensor must be exchanged)
16Calibration drift too high (disinfectant pollution – air the device >2 days)
32Temperature too low (wait for temperature equalization)
64Temperature too high (wait for temperature equalization)
128Zero-point drift (air the device some minutes)
256Sensor backup battery exhausted (must be exchanged by service partner)
512Main battery exhausted
1024H2 reading exceeds 300 ppm
2048Basal value too high (repeat the test, make sure the patient has fasten for at least 12 hours)
4096Quality check failed — reading of test gas out of ±2ppm [±5% of target] range