Question 274Steam Plants - Assistant Engineer

The correct answer is C) dirty flame scanner window. A dirty flame scanner window can cause an automatically fired burner to ignite but then repeatedly go out within two seconds. The flame scanner is responsible for detecting the presence of a flame and sending a signal to the control system. If the scanner window is obstructed by dirt or soot, it may not be able to reliably detect the flame, causing the burner to shut off. This is a common issue that can arise from lack of maintenance or improper burner operation. The other answer choices are incorrect because they do not directly explain the repeated flame outages within two seconds. Issues with pressure signals, fuel oil temperature, or solenoid coils may cause other burner problems, but would not necessarily result in the specific symptom described in the question.