105
Checking the outlet temperature sensor
A
Fig. 72
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. 73
Sensor type: NTC 10 k
Ω
1.
Pull leads from outlet temperature sensor
A
.
2.
Check the sensor resistance and compare it to the
curve.
3.
In the event of severe deviation replace the sensor.
Danger
The outlet temperature sensor is directly
immersed in the DHW (risk of scalding).
Drain the DHW side of the boiler before
replacing the sensor.
Checking the plate heat exchanger
Note
Drain the boiler on the heating water and DHW sides.
During and after removal, small amounts of water may
trickle from the plate heat exchanger.
Troubleshooting
Maintenance
(cont.)
5773 238 GB
Diagnosis
