Outer Case: Unscrew the 4 screws that fasten the lower grating to the underside of the appliance and remove. Remove the 4 screws, 1 each corner then slide case forward and lift off
Fascia / PCB Access To lower the front fascia remove 2 screws at the bottom of the housing, fascia will angle down To access the PCB push 2 clips on the right hand side of the housing in gently and push forwards and out.
Combustion Cover: Remove the 13 screws and remove cover.