247
8 CO/O
2
Control
0043 CO fault
ot/
od
Cell resistance of the CO sensor is outside the monitoring window.
The probe is too cold.
Heating capacity is too low
– Check wiring for probe heating and correct if necessary.
– Check internal probe resistance Ri in LT
Cable cross-section is too small for probe heating.
P
H
= ... W
Range: <100
0044 CO fault Cell temperature of the CO sensor is outside the monitoring window.
A fault occurred during O
2
measured value calibration in air.
– Repeat O
2
measured value calibration in air.
– Check and correct wiring.
– Probe is defective. Range: 700 bis 1.300 K
0045 CO fault
ot/
od
Dynamics of the CO probe too low.
The correction range in the BT300 is too small or set to ’0’.
– Check and correct the correction range.
– Check and correct the electronic ratio curve.
The correction in BT300 is at its limit:
– Correction channel is at limit stop.
Check and correct the electronic ratio curve.
– With CO, the LT does not achieve the necessary probe
dynamics for triggering the CO edge.
Check the trigger threshold for the edge signal in the LT and
adjust it if necessary.
The probe is defective.
0047 CO fault
ot
CO control has been switched off by the monitoring processor.
– Reset fault
– If the fault still exists:
Send error number and diagnostic code to the technical
support.
– Replace the device
0049 CO fault CO control has been switched off by the O
2
monitoring system.
The smallest permissible O
2
value (<0.4 Vol.%) has been exceeded.
– Check whether the burner at which the fault occurred is
running CO
e
free (no CO edge) at the firing rate value and with
less than 0.4 % O
2
.
If yes: Reduce P204. FE 4is required.
If no: Activate increasing air on firing rate change (P232).
AL2 is required.
0050 CO fault
ot
The effective CO probe voltage U
COe
is incorrect.
Is the probe defective?
Value is outside the monitoring window.
Range: 0 ... 100 mV for 20 s
– Remove probe and recalibrate in air.
(see base documentation 1.1 Validity of these Instructions).
If this is not possible, the probe is defective (toxic).
No. Fault/
information
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