Controls Pod Removal: A. Loosen 1 screw either side, front of boiler then slide out and down. B. Drop down panel can be lifted off via the hinges to allow easier access.
PCB / Terminal Block Access: C. 2 screws either side under cover then PCB housing slides forward and down. Combustion Chamber Access: D. Two screws at the back either side then case lifts up and off.
This model does not cover the optional Programmer Kit or Sealed System Unit