Procedure

1. Isolate the water and gas to the appliance at the valves directly below the unit.
2. Remove both gas and water control knobs from the front of appliance
   
3. Remove 2 fixing screws from underside of appliance and ease front cover forward to allow it to lift off top brackets.
   
4. Release water pressure from appliance at a hot water fixture, and disconnect the flexible inlet connection.
   
5. Remove securing pin from outlet to water valve and ease outlet pipe away from water valve to allow removal of complete water section.
   
6. Loosen securing screws on underside of gas valve (pictured below) to allow removal of water section.
   
7. Ease water valve away from gas valve, this will allow the water valve to be dismantled for service
   
8. With water valve removed from the heater , remove the 5 Torx T25 screws from top of water valve to allow access to diaphragm and push rod.
   
9. Remove securing plate and top of water valve and inspect diaphragm and replace if necessary. Remove push rod from top of water valve and apply grease.
   

   Note	The top of the water valve is sealed and has no serviceable parts. If the water valve is showing signs of leakage, replace the top of the water valve (P/N: 8705500105)

10. Remove securing pin from lower connection on water valve and remove plug to allow access to water filter. Remove and clean or replace the filter if necessary.
    

    
11. Re-assemble water valve but do not reinstall yet.
12. Before any attempt is made to service the gas section, remove the self adjusting microswitch from the underside of the gas section by removing the single fixing screw and sliding off spindle of gas section.(IMPORTANT: microswitch will be damaged if this procedure is not followed)
    
13. Remove the single ICU fixing screw to allow the ICU and ICU heat shield to be removed to gain access to the gas valve cap securing screw.
    
14. Remove the securing screw to allow removal of the gas valve cap.
    
15. Remove the gas valve cap by turning anti-clockwise and easing the cap away from gas valve body - Caution - the cap has a spring behind it
    
16. Remove spring and poppet valve from unit to allow access to gas spindle. Remove gas valve from appliance and grease as required. (Note: Gas Valve cannot be removed unless microswitch has been removed)
    
17. Reassemble gas valve fitting ignition microswitch last ensuring it is locked into correct position
18. Water valve can now be attached to the gas section
19. Remove pilot burner by removing screws either side of pilot tube. Remove heat shield from pilot burner and lift pilot burner away from gas valve and disconnect ignition and flame sensor wiring. Pilot burner can now be cleaned. Remove pilot injector and clean or replace injector as necessary.
    
20. To clean burner, loosen the two securing screws from gas valve and two screws from the rear of the burner and ease burner upwards releasing from gas valve and inspect 'O' ring for damage, replace if necessary.
    
21. Remove 8 screws from the rear of burner assembly and seperate the burner bars from the injector rail and clean with compressed air or water. Reassemble burner, refit to gas valve and attach the pilot burner to the main burner assembly
    
22. Refit Gas Valve/Water Valve assembly to appliance and attach the inlet hose to water valve
23. Turn on water supply to appliance and visually check for leaks. Turn on gas supply to appliance and check with soapy water for gas leaks
24. Recommission the appliance as per instructions