What can a blinking light on the furnace control board signify?

A blinking light on the furnace control board typically indicates a malfunction or warning condition. This visual cue is a diagnostic feature integrated into gas furnaces to help technicians and homeowners quickly identify issues with the system.

When the light blinks in a specific pattern, it often corresponds to a code that indicates what type of problem the furnace is experiencing, such as ignition failures, limit switch problems, or failure to detect flame. Understanding these blinking codes is crucial for troubleshooting, as it allows for a quicker resolution of the issue.

Normal operation is indicated by a steady light, not blinking. While maintenance might be suggested if the furnace isn't performing optimally, a blinking light specifically points to a more immediate operational concern. Running in energy-saving mode would not typically trigger any warning lights; thus, a blinking light is more closely associated with system malfunctions. Therefore, recognizing and responding to a blinking light promptly is essential for maintaining efficient and safe furnace operation.