Hamworthy Sherborne Series Installation, Commissioning And Servicing Instructions page 35

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Unplug the 2 connectors from the fan & gas valve.
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Disconnect the 15mm gas connection to the gas valve inlet.
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Remove the 4 screws/nuts securing the fan/venturi/gas valve assembly to the transition duct.
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Withdraw the assembly from the air inlet duct.
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Remove the 25 screws securing the venturi/gas valve assembly to the fan (note the cork sealing gasket).
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Re-assemble in reverse order using new gaskets where necessary.
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Ensure all screws are tightened & electrical plugs are firmly & correctly located.
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Re-light the boiler, check & adjust the combustion as detailed in Section 7.
11.6 Main control PCB
Part No. 533901508 – (SE64he) Nat Gas
Part No. 533901xzy – (SE71c) Nat Gas
Part No. 533901yzx – (SE64he) LPG
Part No. 533901yxz – (SE71c) LPG
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Remove the 2 screws which secure the fascia panel to the controls panel body.
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Carefully withdraw the fascia panel & hang it on the two hooks on the control panel body.
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Disconnect the plug connectors from the main PCB.
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These are polarised to ensure correct engagement.
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Carefully remove the screws securing the pcb to the panel & withdraw the control.
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Re-assemble in reverse order.
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Re-light the boiler & check for operation.
HAMWORTHY HEATING LTD
33
SHERBORNE
Location of orifice
plate - LPG only
500001167/E