139
Checking the flue gas temperature sensor
The flue gas temperature sensor locks out the boiler when the permissible flue gas
temperature is exceeded. Reset the interlock after the flue system has cooled down
by pressing reset button
R
.
A
1.
Pull leads from 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 k
Ω
Sensor type: NTC 10 kΩ
2.
Check the sensor resistance and
compare it with the curve.
3.
Replace the sensor in the case of
severe deviation.
Fault during commissioning (fault A3)
During commissioning, the control unit checks correct placement of the flue gas tem-
perature sensor. If commissioning is terminated and fault message A3 is displayed:
Troubleshooting
Repair
(cont.)
5623 520 GB
Service
Содержание Series B2HA 40
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