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17.8 Visually check for debris/damage and clean or replace as necessary the following items
as shown in the previous pictures:
•
Heat exchanger
•
Burner
•
Fan
•
Electrodes
•
Insulation/gaskets
17.9 The boiler is fi tted with a domestic cold water inlet fi lter, which may become blocked
during the use of the boiler causing the water fl ow rate to become reduced. To gain access
to the fi lter:
•
Close the isolating valve on boiler's cold water inlet by turning the valve head fully
clockwise.
•
Open one or more hot water taps to drain the hot water circuit.
•
Disconnect the cold water inlet connection to the boiler.
•
Remove the fi lter housing from below the boiler using a 14mm spanner. Clean and
inspect the fi lter, replace if necessary as described in section 18.16.
•
Re-fi t the fi lter and reinstate the cold water inlet connection to the boiler.
•
Fully open the isolating valve on the boiler's cold water inlet and check for leaks when
the hot water taps are closed and the circuit is pressurised .
17.10 On completing the service reassemble the boiler components in reverse order.
Take care not to damage or dislodge the gas restrictor and ensure that all component joints,
gaskets are sound. Any damaged gaskets must be replaced.
17.11 Reinstate the boiler's electrical and gas supplies and check for gas tightness and
correct boiler operation.
17.12 Due to the construction of the heat exchanger the condensate trap should not become
contaminated. However, it may be fl ushed if required by pouring hot water through the heat
exchanger discharge pipe, which can be seen in fi gure 31a. If this is not successful the bowl
of the trap can be removed using a large allen key in the socket of the outlet tube of the bowl
after the fl exible pipe has been removed from underneath, please be sure the electrical
connections condensate trap (upper connector-alive [ionisation], lower connector-earth)
see fi gure 31b.
29
IMPORTANT!
•
Clean the heat exchanger using a soft brush or
vacuum cleaner. Do not use any tool likely to damage the
surface of the heat exchanger.
•
Clean the burner by washing in soapy water. Allow to
dry thoroughly before re-fi tting.
•
Do not use wire or a sharp instrument to clean the
burner ports.
Figure 31a
Figure 31b
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