Troubleshooting
28
Supplement
Fabius plus SW 3.n
Failure of the O
2
sensor
The terminology for the O2 sensor has changed.
Causes for faulty calibration
The calibration was not successful if, after the
calibration of the O
2
sensor, the alarm message
O
2
SENSOR FAIL !
is displayed.
Possible causes and remedial measures are
described in the following table.
Cause
Remedy
During the calibration, the O
2
sensor was exposed
to an air mixture with extremely high or low oxygen
concentration.
Make sure that the O
2
sensor is exposed to ambi-
ent air during the entire calibration.
During the calibration, the O
2
sensor was exposed
to an air mixture with fluctuating oxygen concentra-
tion.
Make sure that the O
2
sensor is exposed to ambi-
ent air during the entire calibration.
The O
2
sensor was not exposed to ambient air long
enough before the calibration.
Expose the O
2
sensor to ambient air for 2 minutes.
If a new O
2
sensor capsule has been inserted,
expose the O
2
sensor to ambient air for
15 minutes.
The maximum period of use of the O
2
sensor cap-
sule has elapsed.
Replace the O
2
sensor capsule. Expose the O
2
sensor to ambient air for 15 minutes before calibra-
tion.
The O
2
sensor is not connected.
Check that the plug on the O
2
sensor cable is
plugged into the marked connector on the rear of
the device.
Check that the O
2
sensor capsule has been cor-
rectly inserted into the O
2
sensor housing.
Connect the O
2
sensor correctly and recalibrate.