127
Checking the boiler water temperature sensor, cylinder temperature sensor or flow temperature
sensor of low loss header
%
X3
A
Fig. 98
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. 99
Sensor type: NTC 10 k
Ω
1.
■
Boiler water temperature sensor
Pull off leads from boiler water temperature sen-
sor
A
and check resistance.
■
Cylinder temperature sensor
Pull plug
%
from the cable harness at the control
unit and check resistance.
■
Flow temperature sensor
Pull plug "X3" at the control unit and check resist-
ance across terminals "X3.4" and "X3.5".
2.
Compare the sensor resistance with the curve.
3.
In the event of severe deviation replace the sensor.
Danger
The boiler water temperature sensor is
directly immersed in the heating water (risk
of scalding).
Drain the boiler on the heating water side
before replacing the sensor.
Troubleshooting
Repairs (gas condensing module)
(cont.)
5775 636 GB
Diagnosis
Summary of Contents for C3TB
Page 136: ...136 Troubleshooting Repairs gas condensing module cont 5775 636 GB Diagnosis ...
Page 143: ...143 Parts lists Heat cell assembly 5775 636 GB Components ...
Page 160: ...160 Parts not shown 0009 PCB IU100 B30 Parts lists Fuel cell assembly 5775 636 GB Components ...
Page 161: ...161 Parts lists Fuel cell assembly cont 5775 636 GB Components ...
Page 187: ...187 5775 636 GB ...
