103
Checking the boiler temperature sensor, cylinder temperature sensor or flow temperature sen-
sor for low loss header
X3
5
A
Fig. 68
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. 69
Sensor type: NTC 10 k
Ω
1.
■
Boiler water temperature sensor
Pull out the leads at boiler water temperature sen-
sor
A
and check the resistance.
■
Cylinder temperature sensor
Pull out plug
%
from the cable harness at the
control unit and check the resistance.
■
Flow temperature sensor
Pull out plug "X3" at the control unit and check
the resistance across terminals "X3.4" and "X3.5".
2.
Check the sensor resistance and compare it with
the curve.
Troubleshooting
Maintenance
(cont.)
5773 238 GB
Diagnosis
