What is typically a consequence of a malfunctioning flame scanner?

A malfunctioning flame scanner is primarily responsible for detecting the presence of a flame in a combustion system, such as a high-pressure boiler. When the flame scanner fails, it may not accurately sense the existence of a flame, leading to a situation where the burner control system interprets this as a flame failure. This can trigger safety mechanisms designed to shut down the burner to prevent an explosion or other hazardous conditions that could arise from the absence of flame detection.

As a result, flame failure is a direct consequence of a malfunctioning flame scanner. The scanner is critical for ensuring the safe operation of the burner, and if it does not function correctly, it compromises overall safety, leading to potential shutdowns or equipment failure. Thus, the correct answer highlights the importance of the flame scanner in monitoring flame presence for safe boiler operations.