Service manual

Service manual E000129004
6
Fig. 15
2.4. Main circuit pressure sensor
The main circuit pressure sensor is connected to the
outlet port of the pump and translates the pressure of the
main circuit to an electrical signal.
F Removal
Warning: isolate the boiler from the mains
electricity supply before removing any covering or
component.
1 Remove the cover (section 1.4)
2 Empty the main circuit (section 1.5
3 Lower the control panel (section 1.7
4 Disconnect the connector A (Fig. 16).
5 Unscrew the sensor B.
6 Re-assemble the parts following the removal
procedures in the reverse order.
Fig. 16
2.5. Flow water temperature sensor
The flow temperature sensor has the function of
converting the temperature of the water flowing in the
outlet pipe of the main heat exchanger into an electric
signal (resistance).
F Check
Warning: isolate the boiler from the mains
electricity supply before removing any covering or
component.
1 Remove the cover (section 1.4).
2 Disconnect the connectors A (Fig. 17).
3 Measure the resistance between the leads of the
sensor. At a normal temperature of 25 °C the resistance
should be about 12 kOhm.
F Removal
Warning: isolate the boiler from the mains
electricity supply before removing any covering or
component.
1 Remove the cover (section 1.4).
2 Disconnect the connectors A (Fig. 17).
3 Remove the temperature sensor
4 Re-assemble the sensor following the removal
procedures in the reverse order.
Fig. 17