Note: Ensure the gas supply to the boiler and the mains electricity supply have been isolated prior to
commencing this work.
Perform the following to remove/clean the burner:
1. Remove the top and both front panels from the boiler frame, carefully disconnecting the 3 block
connectors on the controller on the top front panel:
• black 12 pin connector block, with wiring labelled “DSP X01”
• black 10 pin connector block, with wiring labelled “DISP X04”
• white 6 pin connector block, with wiring labelled “DSP X05”
Store all panels in a safe location.
2. Disconnect both block connectors from the pre-mix blower:
• white 3 pin connector block, with wiring labelled “FAN X1”
• white 4-pin connector block, with wiring labelled “FAN X2”
3. Disconnect the 2 grey angled block connectors from the gas valve and gas pressure switch:
• wiring labelled “GAS PL1” from the gas valve
• wiring labelled “GAS PS1” from the gas pressure switch
Note: Each of these connectors in point 3 is secured in place with a screw headed M4 bolt.
4. Ensure the entire gas valve/venturi/blower assembly is supported ready for removal.
5. Disconnect the four allen bolts from the bottom of the gas valve. Inspect the o-ring located
between these two anges for signs of deterioration, replace if required.
6. Disconnect the 4 M8 bolts securing the gas valve/venturi/blower assembly to the apper, lift the
entire assembly out of the unit and put in a safe position where no dust or other contaminants
can get into the assembly. Inspect the square rubber gasket between the blower and the apper
for signs of deterioration, replace if necessary.
Note: Adequate preparation and care should be taken when removing this assembly, as it is heavy.
7. Disconnect the cables from the ignition transformer, the ionisation probe and the ignition
electrode:
• brown cable with an angle rajah connector, labelled “ION” from the ionisation probe on the
bottom front of the heat exchanger
• orange cable with an angle rajah connector between the ignition transformer (top left corner)
and the ignition electrode on the right hand side of the front of the heat exchanger
• green & yellow cable with a spade connector, labelled “earth” from the connector next to the
ignition electrode
• white 6-pin connector block, with wiring labelled “FLAP X3” from the apper block connector
8. Undo the four nuts holding the apper-mounting plate to the heat exchanger.
4.8
PROCEDURE FOR REMOVING/CLEANING THE BURNER
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