|Analog output reading is unchanging and appears incorrect.||Analog output is in error state.||Remove the cause of the error state and the analog output will recover its normal function.|
|Probe outputs stars "****" on serial line instead of measurement data.||Incorrect supply voltage.||Check the power supply.
Check the active errors using the ERRS command on the serial line.
|Unsuitable operating environment.||Verify that the operating environment is within specified operating limits.|
|Unable to access probe on the RS-485 line.||Incorrect wiring.||Check that the RS-485 connection is wired correctly.|
|Probe in POLL mode with unknown address.||Power cycle or reset the probe and try again.|
|CO2 measurement not working.||Condensation on the sensor.||Remove the filter and check if condensation has formed on the sensor. If yes, dry out the condensation with instrument air and insert a new dry filter. Keep the probe powered and operating to prevent re-occurrence.|