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18. Component Replacement
CAUTION!
While there are no substances harmful to health
contained within this appliance, some component
parts of the boiler (insulation pads, gaskets and rope
seals) are manufactured from man made fibres.
When damaged or broken these fibres may cause a
temporary irritation. High dust levels may irritate
eyes and upper respiratory system. It is important
therefore, that sensible precautions are applied
when exchanging components.
18.1 Ensure that both the electrical and gas
supplies to the boiler are isolated before
replacing any component part.
18.2 To prevent the need to drain the entire
heating system when replacing the boiler's
integral pump, expansion vessel, safety relief
valve and pressure sensor, the boiler's
hydraulic circuit may be isolated from the
central heating circuit by closing the boilers
isolation valves. Opening the drain valve at the
back of the pump will then drain the boiler's
27
hydraulic circuit.
18.3 For replacement of the following
components it will be necessary to remove the
boiler casing panels as described in Section
17.
18.4 Domestic hot water sensor
The domestic hot water probe is located on
the left side of the diverter valve,
water side. (figure 31)
Carefully disconnect the leads from the
sensor.
Remove the sensor using a 13mm spanner.
Fit the replacement sensor sealing as
required.
Re-fit the leads to the replacement sensor
Figure 31
18.5 Central heating and Flue sensor
The Central heating ntc sensor is located on the
flow pipe.
The Flue sensor is located on the plastic flue
socket.
Disconnect the leads from the sensors.
Remove the sensors from the pipe/plastic flue.
Fit replacement sensors.
Fit the leads to replacement sensors.
Figure 32
Flue NTC
sensor
hot
18.6 Fan Unit
Remove the burner/fan assembly as in 17.8.
Remove the electrical leads from the fan.
Disconnect the fan.
Fit the replacement fan unit in reverse order
and reconnect all electrical leads before
reassembling to the combustion chamber.
Page 27
solaris 24PC, 30PC
Central heating
NTC sensor
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