Viessmann Vitotwin 300-W - Page 146

146
1. Pull the leads from internal appliance
temperature sensor
A
and check
the resistance.
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
Sensor type: NTC 10 kΩ
2. Check the sensor resistance and
compare it with the curve.
3. Replace the sensor in the case of
severe deviation.
Checking flow temperature sensor heating circuit
?
BSB
aJ
?
1.
Remove plug ? from the extension
for heating circuit with mixer.
Troubleshooting
Repairs
(cont.)
5618 294 GB