Fig. W.1: Cleaning the burner and primary heat exchanger
Euro B/S 059/0
Cleaning the burner and
primary heat exchanger
● Turn off the boiler.
● Isolate the electrical supply to the
boiler.
● Remove the boiler case as
described on page 22.
● Turn off the gas service valve.
● Turn off the boiler CH service
valves.
● Turn off the cold water inlet service
valve.
● Release the three clamps (1),
remove the combustion chamber
cover (2) and then remove the flue
gas connector (2a) on the fan.
● Remove the retaining spring (3).
● Pull the three cables (4) and two
tubes (5) from the fan assembly.
● Remove the fan assembly (6).
● Remove the four screws (7) and
detach the front cover panel from
the combustion chamber (8).
● Check the burner (9) and heat
exchanger fins (10) and remove
any loose deposits with a soft
brush.
● Reassemble in reverse order.
Check central heating expansion
vessel.
● Release the system water pressure
from the boiler.
● Remove valve cap from expansion
vessel charge point.
● Check that the internal charge
pressure of expansion vessel is
between 0.7 - 0.9 bar. If pressure
is lower than this the vessel should
be re-pressurised using an air
pump.
● Refit valve cap.
● Open central heating service
valves and re-pressurise the boiler
and heating system if necessary.
● Open the gas service valve.
● Turn on the mains power supply.
● Operate the boiler and carry out
soundness, safety and function
checks.
● Complete the service interval
record section in the log book and
leave with the user.
Note: It is not necessary to carry out
this check every year – a check
every three years should be
sufficient.
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