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59
15 Replacement of Parts
15.19 Domestic Hot Water Thermistor
For access, refer to section 15.1.
Refer to diagram 15.14.
Disconnect the domestic hot water thermistor electrical
connections
Remove hot water thermistor and r
etaining clip.
Remove domestic hot water thermistor from clip.
NOTE: When reconnecting electrical connections, polarity is
not important.
Carry out a functional test of the contr
ols.
15.20Automatic Air Vent
For access, refer to section 15.1.
Drain the boiler heating circuit as described in the
appropriate section of 15.1.
Refer to diagram 15.15 and gain access through the plastic
maintenance cover.
Unscrew the automatic air vent.
Fit the new automatic air vent and ‘O’ ring ensuring the vent
cap is left loose.
Refill, vent and pr
essurise the boiler.
15.21 Low Water Pressure Sensor
For access, refer to section 15.1.
Drain the boiler heating circuit as described in the
appropriate section of 15.1.
Refer to diagram 15.16.
Disconnect the electrical lead.
Remove the r
etaining clip, remove the low water pressure
sensor.
Fit new ‘O’ ring.
Fit the new low water pr
essur
e sensor.
Refill vent and pressurise the boiler.
13258
Diagram 15.15
AUTOMATIC
AIR VENT
RETAINING
CLIP
MAINTENANCE
COVER
Diagram 15.14
13550
RETAINING
CLIP
LOW WATER
PRESSURE
SENSOR
ELECTRICAL
LEADS
LH
HYDROBLOCK
13315
Diagram 15.16
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