1. Outer Case 3 screws at bottom of appliance, rear left & right and front centre then lift upwards to remove. 2. Combustion Chamber + Side Panels 2 clips to remove front panel then 2 screws for each side panel. 3. Terminal Block 1 screw then unclip to expose mains connections. 4. PCB Access 4 screws each corner and 4 corresponding clips then lift up.