A method of evaluating the performance of a control system using an electronic device having state machine logic. The state machine logic includes determining a first logic state representative of a first condition of the control system based on data received from the control system. The state machine logic also includes executing a first testing function and transitioning to a second logic state representative of a second condition of the control system based on at least one of the received data and output from the first testing function. The state machine logic further includes executing a second testing function and providing a diagnosis of the performance of the control system based on the output of at least one of the first testing function and the second testing function.