Error Message Description Recommended Action
Critical errors
Program memory crc critical error Program memory is corrupted. Fatal error, contact Vaisala.
Parameter memory crc critical
error
Parameter memory is corrupted. Fatal error, contact Vaisala.
Errors
Low supply voltage error Check supply voltage.
Internal 30 V error Low internal 30 V voltage.
Low RX signal error Low input signal. Can be caused by
dirt or condensation on the optical
surfaces.
Wait to see if condensation is
removed by heat.
Internal 8 V error Low internal 8 V voltage.
RX signal cut error Signal distortion (EMC
interference)
Out of measurement range error CO
2
concentration is too high to
measure.
Wait for CO
2
concentration to fall
into the measurable range.
Sensor heater error Sensor heater resistance is out of
range.
IR temperature error IR source temperature error.
FPI slope error Signal receiver error. Contact Vaisala.
Internal 2.5 V error Internal 2.5 V voltage out of range.
Internal 1.7 V error Internal 1.7 V voltage out of range.
Low IR current error IR source failure. Contact Vaisala.
Warnings
Signal too low warning Low input signal. Can be caused by
dirt or condensation on the optical
surfaces.
Continue normally.
Cut warning EMC interference error limit
approaching.
Check for EMC interference
sources.
Unexpected restart detected Transmitter is reset by watchdog
process.
Continue normally.
Status messages
CO
2
adjustment mode active Complete the CO
2
adjustment.
10.3 Analog Output Error State
The probe sets the analog output channel into a defined error level instead of the measured
result in two situations:
GMP252 User Guide M211897EN-D
100
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