1.
&
Boiler water temperature sen-
sor
Pull the leads off the boiler tem-
perature sensor and check the
resistance.
&
Cylinder temperature sensor
Pull plug
%
from the cable har-
ness at the control unit and check
the resistance.
&
Flow temperature sensor
Pull plug "X3" from the control
unit and check the resistance
across terminals "X3.4" and
"X3.5".
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 boiler before
replacing the sensor.
Checking the outlet temperature sensor
1.
Pull the leads from outlet tempera-
ture sensor
A
.
2.
Check the sensor resistance and
compare it with the curve.
Repairs
(cont.)
84
Troubleshooting
5692
731
GB
Summary of Contents for VITODENS 333-F WS3A
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