104
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.
Checking the collector temperature sensor or cylinder temperature sensor on the solar control
module
The solar control module is attached to the left side of
the air box.
%
&
aVG
Fig. 70
0.1
1
10
100
0
20
40
60
80
100
120
140
Temperature in °C
Resistance
in kΩ
A
B
25
Fig. 71
A
Collector temperature sensor (sensor type: NTC
20 k
Ω
)
B
Cylinder temperature sensor (sensor type: NTC
10 k
Ω
)
1.
■
Cylinder temperature sensor
Remove plug
%
from solar control module
A
and check the resistance.
■
Collector temperature sensor
Disconnect the lead from terminal box
B
and
check the resistance.
2.
Compare the sensor resistance with the curve.
3.
In the event of severe deviation replace the sensor.
Troubleshooting
Maintenance
(cont.)
5773 238 GB
Diagnosis
