Instructions

CO260-en-GB_v1.0 8/17
13
Troubleshooting
Maintenance
CLEANING AND STORAGE
1. Clean the meter with a damp cloth and mild detergent when necessary. Do not use solvents
or abrasives.
2. Store the meter in an area with moderate temperature and humidity (refer to the operating
and storage temperature ranges in the specifications section).
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Error
Problem
Solution
Display No display when pressing power button
Ensure that batteries are properly
installed with correct polarity
Press and hold power button to retry
Replace batteries
Open the battery compartment and
using a small metal tip, press the
reset button
Display Readings frozen on display
Check to see if data hold function is
activated. Press hold to deactivate.
Display Slow Response
Check for air flow blockage to
sensors
E01/E33
CO
2
sensor is not working
Replace the battery
E02
Measurement is below the range of the meter
Check readings in a different area
E03
Measurement is above the range of the meter
Check readings in a different area
E04
Data error
Contact Extech for service
E11
Humidity calibration Error
Retry humidity calibration
E16
CO calibration error
Contact Extech for service
E31
A/D or temperature sensor failure
Contact Extech for service
E32
Memory failure
Contact Extech for service
E33
A/D or humidity sensor failure
Contact Extech for service
E33
Measurement circuit failure
Contact Extech for service