Potterton SIRIUS FS Installation & Servicing Instructions Manual page 50

It is recommended that the following actions should be carried out with the boiler isolated
from the electrical and gas supply :-
Burner Head
Remove the burner head (see section 7.3.16 & 7.3.17, P58) and inspect the condition
of the burner head. Discolouration or black markings may indicate an incorrect gas
mixture or air vent blockage. Replace the burner head if there is any visible damage.
Insulation
Inspect the condition of the heat insulation at the rear of the heat exchanger and
on the heat exchanger door. The heat insulation material must be changed if there
are any signs of water damage or other significant degradation.
Gaskets
Inspect the condition of the door rope gasket, silicone lip gasket and the gasket
connecting the air flap to the burner door. Replace if the rope gasket if it is damaged.
Replace the gaskets if they appear worn, brittle or damaged.
Ignition and ionisation electrodes
clean all electrodes with a fine wire brush and check the ceramic insulation is free
from cracks or damage. Check the ignition electrode gap is between 4 & 5mm.
Replace any defective electrodes, ensuring that a new electrode gasket is fitted.
Air control valve
Inspect condition of seal around the interior of the air control valve and check
operation of the valve. The valve should close securely on its magnet and open with
a little resistance.
Burner head
Door insulation
Door gasket
Sirius FS
Ionisation electrode
48
Ignition electrode
Connecting gasket
Air control valve
GB/IE