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

18.29 Gas control valve stepper motor, refer todiagram 18.18Before 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.• Remove the gas control valve, refer to Section 18.28.• Disconnect the electrical connection from stepper motor.• Remove the two screws securing stepper motor to the gascontrol valve.• Fit replacement gas control valve stepper motor.• Note: Take care not to damage the 'O' ring.18 Replacement of Parts➜9768THREE WAYVALVE HEAD18.30 Discharge safety valve, refer to diagram18.19.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.• Undo discharge pipe union nut.• Pull out slotted metal clip from valve body and remove valve.9769➜18.31 (F24E Only) Three-way valve head, referto diagram 18.20.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.• Remove gas control valve, refer to Section 18.28. (It will notbe necessary to remove the gas control electrical cables).• Remove electrical plug from valve head.• Pull out slotted metal clip from valve body and remove valvehead from body.• Fit replacement valve head.Note :1) When refitting clip, ensure that letters YES are as shown.2) It is not necessary to drain boiler to carry out this work.F24E only10017➜Diagram 18.20THREE WAYVALVE/ BYPASSHOUSINGTHREE WAYVALVEACTUATOR9785F24E onlyDiagram 18.21➜9767➜➜➜IGNITIONUNITDiagram 18.2249 4000124050-2