Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual page 102

Troubleshooting
Repairs
(cont.)
Checking the collector temperature sensor S1, temperature
sensor S2 or S3
102
2. Check the sensor resistance and
compare the actual values with the
curve.
3. Replace the sensor in case of
severe deviation.
Danger
The boiler water tempera-
ture sensor is immersed in
the heating water (risk of
scalding).
Drain the heating water side
of the compact boiler before
replacing the sensor.
1. Remove the cover from the wiring
chamber of the Vitosolic 100.