48
Checking the flue gas temperature sensor
A
Fig. 43
1.
Disconnect leads at flue gas temperature sensor
A
.
10
1
10 30 50 70 90 110
Temperature in °C
0.4
0.6
0.8
2
4
6
8
20
Resistance
in kΩ
Fig. 44
2.
Check the sensor resistance and compare it to the
curve.
3.
In the event of severe deviation replace the sensor.
Fault "A3" during commissioning
During commissioning, the control unit checks whether
the flue gas temperature sensor is correctly positioned.
If the flue gas temperature sensor is incorrectly posi-
tioned, commissioning is aborted and fault message
A3 is shown.
1.
Check whether the flue gas temperature sensor is
correctly inserted. See previous diagram.
2.
If necessary, correct the position of the flue gas
temperature sensor or replace the faulty flue gas
temperature sensor.
3.
Tap and hold
R
for approx. 2 s and repeat commis-
sioning.
The check is repeated until it is completed suc-
cessfully.
Note
If a stable flame is not formed during the sensor test,
repeat the test several times.
Troubleshooting
Repairs
(cont.)
5697789
Diagnosis
Содержание Vitodens 111-W
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