Glow-worm Ultrapower sxi Series Installation And Servicing page 63

FAN
15.21 Heating Return Thermistor
For access, refer to section 15.1.
Refer to diagram 15.17.
Remove the electrical connections from the thermistor.
Remove the thermistor and noting its position on the return
pipe.
NOTE: When reconnecting, the polarity of the wiring to
thermistors is not important.
15.22 Automatic Air Vent
For access, refer to section 15.1.
Refer to section 15.1 and drain the boiler heating circuit.
Refer to diagram 15.18.
Remove the retaining clip to release the automatic air vent.
Fit the new automatic air vent and 'O' ring ensuring the vent
cap is left loose.
15.23 Water Pressure Sensor
For access, refer to section 15.1.
Refer to section 15.1 and drain the boiler heating circuit.
Refer to diagram 15.19.
Disconnect the electrical lead and withdraw the lead plug.
Remove the retaining clip to remove the low water pressure
sensor.
Fit new 'O' ring.
15 Replacement of Parts
HEATING
RETURN
THERMISTOR
Diagram 15.17
63
LOW WATER
PRESSURE
SENSOR
RETAINING
AUTOMATIC
AIR VENT
RETAINING
CLIP
Diagram 15.18
ELECTRICAL
LEADS
LH
HYDROBLOCK
CLIP
Diagram 15.19