What Is a Flame Sensor?
A flame sensor is a safety component that confirms a furnace's burner has actually ignited. If it doesn't detect a flame within a set time, it shuts the gas valve to prevent unburned gas from accumulating — a common cause of a furnace that tries to start and then shuts back off.
Why It Matters to You
A dirty or failing flame sensor is one of the most common reasons a furnace won't stay running, and it's often mistaken for a bigger, more expensive problem.
Practical Guidance
If your furnace ignites briefly and then shuts off repeatedly, mention the flame sensor specifically when you call for service — it's a quick, inexpensive fix in many cases.
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