1.
&
Boiler water temperature sen-
sor
&
Pull the leads off the boiler tem-
perature sensor and check the
resistance.
&
Comfort 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. Compare the actual sensor resis-
tance 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.
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