Saunier-Duval-Thema-Classic-F24e-Installation-manual

18.25 System water pressure sensor, refer todiagram 18.15.Before starting refer to the front of Section 18 Importantinformation.• Remove the front panel, refer to Section 15.3.• Lower the control panel, refer to Section 15.4.Drain down the boiler, refer to relevant part of Section 18.1.• Remove electrical connections from water pressure sensor.• Pull off slotted metal clip and remove water pressure sensor.Please ensure that the new "O" ring and clip supplied are fitted.18 Replacement of Parts11591GAS CONTROLVALVE➜978118.26 Bypass valve, refer to diagram 14.1.Before starting refer to the front of Section 18 Importantinformation.• Remove the front panel, refer to Section 15.3.• Lower the control panel, refer to Section 15.4.Drain down the boiler, refer to relevant part of Section 18.1.• Remove the ignition unit, refer to Section 18.33.Pull out slotted metal clip, ease out bypass valve from bypassvalve housing.➜F24E shown➜➜9782Diagram 18.1718.27 Automatic air vent, refer to diagram18.16.Before starting refer to the front of Section 18 Importantinformation.• Remove the front panel, refer to Section 15.3.• Lower the control panel, refer to Section 15.4.• Drain down the boiler only, refer to relevant part of diagram18.1.• Unscrew to remove automatic air vent.• After fitting replacement automatic air vent ensure the cap isopen.10018➜➜GAS CONTROLVALVESTEPPERMOTOR18.28 Gas Control valve, refer to diagram18.17.Before starting refer to the front of Section 18 Importantinformation.• Remove the front panel, refer to Section 15.3.• Lower the control panel, refer to Section 15.4.• Disconnect gas supply pipes union nuts at the gas controlvalve.• Disconnect supply pipe union nut at the burner injector bar.• Remove the locking nut and brass washer from underside ofgas control valve.• Ease gas control valve forwards and disconnect electricalconnections to gas control valve.• Withdraw gas control valve assembly.Note: Use the new washers supplied with the gas control valve.• Fit gas valve restrictor to replacement gas control value.• Fit replacement gas control valve.Check the Min. gas pressure and if it requires adjusting, referto Section 13 Changing Gas Type.➜➜F24E shown➜Diagram 18.1811585PRESSURERELIEFVALVEDiagram 18.194000124050-248