The error messages are categorized according to the severity of the status:
- Critical errors are fatal to the operation of the unit. It may not be able to respond to communication at all, and will not measure correctly.
- Errors prevent CO2 measurement and cause the analog outputs to be set to the error state. Depending on the problem, errors may resolve themselves. For example, sensor heating will eventually dry out condensation on the optical surfaces.
- Warnings do not prevent normal operation but may indicate possible problems.
- Status indicates a known state of the unit.
In case of constant error, contact Vaisala.
If using the probe in Modbus mode, see the possible error messages in Table 2.
| Error message and code | Description | Recommended action |
|---|---|---|
| Critical errors | ||
| Program memory crc critical error [1] | Program memory is corrupted. | Fatal error, contact Vaisala technical support. |
| Parameter memory crc critical error [2] | Parameter memory is corrupted. | Fatal error, contact Vaisala technical support. |
| Errors | ||
| Low supply voltage error [5] | Check and correct the supply voltage. | |
| Internal 30V error [6] | Low internal 30 V voltage. | |
| Low RX signal error [7] | Low input signal. Can be caused by dirt or condensation on the optical surfaces. | Wait to see if condensation is removed by heat. |
| Internal 8V error [8] | Low internal 8 V voltage. | |
| RX signal cut error [9] | Signal distortion (EMC interference) | |
| Out of measurement range error [13] | CO2 concentration is too high to measure. | Wait for CO2 concentration to fall into the measurable range. |
| Sensor heater error [14] | Sensor heater resistance is out of range. | |
| IR temperature error [15] | Infrared source temperature error. | |
| FPI slope error [16] | Signal receiver error. | Contact Vaisala technical support. |
| Internal 2.5V error [17] | Internal 2.5 V voltage out of range. | |
| Internal 1.7V error [18] | Internal 1.7 V voltage out of range. | |
| Low IR current error [19] | Infrared source failure. | Contact Vaisala technical support. |
| Warnings | ||
| Signal too low warning [21] | Low input signal. Can be caused by dirt or condensation on the optical surfaces. | Continue normally. |
| Cut warning [23] | EMC interference error limit approaching. | Check for EMC interference sources. |
| Unexpected restart detected [24] | Transmitter is reset by watchdog process. | Continue normally. |
| Status messages | ||
| CO2 adjustment mode active [27] | Complete the CO2 adjustment. | |
| Calibration about to expire [29] | This message is displayed by the calibration reminder functionality. | Calibrate the probe and update the calibration date information. |
| Calibration expired [30] | This warning is displayed by the calibration reminder functionality if the calibration interval has been exceeded. | |