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TROUBLESHOOTING
Can’t turn the meter on?
Press
SET
for more than 3 seconds and try again. Check
that the batteries have been installed properly (check for
correct polarity) and/or that the adapter is firmly plugged in.
Frozen readings?
Data Hold function is enabled (Data Hold icon located at the
top left). Disable the Data Hold function.
Slow Response?
Ensure that the air flow channels located at the top-rear of
the unit are not blocked.
E01: CO
2
sensor is damaged.
E02: The value is under range.
E03: The value is over range.
E04: The temperature or humidity data error results in this
DP, WB error.
E07: Voltage too low to measure CO
2
. Replace batteries
or use adapter.
E11: Retry humidity calibration.
E17: Retry
CO
2
calibration.
E31: Temperature sensor is damaged.
E34: Humidity sensor is damaged.
Error Messages
