Instructions

9 | Error and system messages DO-400
26 / 29 B-H86.0.21.DB214-1.0
9 Error and system messages
Display Meaning Possible causes Remedy
No display,
unclear char-
acters or no
response
when but-
tons are
pressed
Battery depleted
System error
Product is defective
Battery depleted
Error in the product
Product is defective
Replace battery
Send in for repair
BAT
Battery depleted Battery depleted Replace battery
BAT LO
Battery depleted Battery depleted Replace battery
(AL ERR.2
Slope is too low
Incorrect oxygen ref-
erence
Electrode contamin-
ated or defective
Perform calibration in damp
environmental air
Maintain the electrode
(AL ERR.3
Slope is too high
Incorrect oxygen ref-
erence
Electrode contamin-
ated or defective
Perform calibration in damp
environmental air
Maintain the electrode
(AL ERR.4
Incorrect calibration
temperature
Temperature too low
or too high
Range of 5..40 °C
(AL ERR.5
Time exceeded dur-
ing automatic calib-
ration
Unstable electrode
signal
Contaminated elec-
trode
Temperature not
equalised
Use calibration container
Maintain the electrode
Restart calibration
ERR.1
Measuring range ex-
ceeded
Measurement too
high
Electrode or product
defect
Faulty calibration
The measurement is above
the permissible range
Check electrode
Perform calibration
Send in for repair
ERR.2
Measuring range is
undercut
Measurement too
low
Electrode or product
defect
Check electrode
Send in for repair
SYS ERR
System error Error in the product Switch product on/off
Replace batteries
Send in for repair