51
6 Correcting Faults
/4 OFF current too high
/5 Heating control circuit open
Heater controller at limit stop for longer than 30 seconds.
Help:
Check wiring between probe and LT3 (check probe signals terminals 10/
11/12)
/6 Temperature of the O
2
sensor too high (R
ki
-O
2
too low)
For longer than 10 seconds, R
ki
-O
2
is under 10
Heater R
i
outside of 5 ... 15
Internal resistance of heater outside of the interval 5 ... 15
/7 Temperature of the CO sensor too high (R
ki
-CO too low)
For longer than 10 seconds, R
ki
-CO is under 10
003 (HP)
103 (ÜP)
Internal fault of analogue signal processing
Device defective
- Contact the manufacturer. Specify the trigger for diagnostic purposes.
004 (HP)
104 (ÜP)
Internal resistance of ceramics of the O
2
electrode
/1 R
ki
O
2
too high. Internal resistance of ceramics of O
2
for LT3-F over 50 ,
and/or for LT3 over 100 , tolerance time of 30 seconds.
/2 R
ki
O
2
too low. Internal resistance of ceramics of O
2
under 10 , tolerance
time of 30 seconds.
Help:
If R
ki
-O
2
for LT3-F over 50 , and/or for LT3 over 100 , then
- Probe too cold.
- Internal resistance regulation not active or incorrect setpoint value.
- The probe is stuck in a cold spot and the heating capacity does not suf-
fice.
Look for a new installation position.
- Flow speed too high.
- Heating defective and probe cold.
- Sensor breakage.
- Check wiring between probe and LT3
(signal terminals 10/11/12)
If R
ki
-O
2
under 10 , probe is too hot, internal resistance regulation is not
active, or incorrect setpoint value.
The optimum operating point (setpoint value) lies at 20 .
005 (HP)
105 (ÜP)
Internal resistance of ceramics of the CO/H
2
electrode
/1 R
ki
-CO too high. Internal resistance of ceramics of CO for LT3-F over 50 ,
and/or for LT3 over 100 , tolerance time of 30 seconds.
/2 R
ki
-CO too low. Internal resistance of ceramics of O2 under 10 , toler-
ance time of 30 seconds.
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