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Troubleshooting
Repairs
Checking the boiler water temperature sensor and the flue
gas temperature sensor
1. Check the sensor resistance.
Boiler water temperature sensor
Resistance: NTC 5 k
Temperature
Pressure drop
in °C
in k
30
4.03
40
2.66
50
1.80
60
1.24
70
0.87
Flue gas temperature sensor
Resistance: PT 1000
Temperature
Pressure drop
in °C
in k
20
1.08
60
1.23
90
1.35
120
1.46
150
1.57
26
2. Disconnect cores from the sensor,
if actual values deviate severely
from the curve, repeat sensor mea-
surements and compare with the
actual temperature (for scanning,
see operating instructions).
3. Depending on the result, replace
the lead or the sensor.
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