A flame sensor is one of the most important safety features of your furnace. This component is responsible for ensuring that your furnace doesn’t create a dangerous gas leak or explosion.

Jun 3, 2025 · Good flame sensor: A properly functioning flame sensor will shut down the gas valve when it does not sense a flame when the furnace should be firing. Bad flame sensor: …

5 days ago · A flame sensor in a furnace is a thin metal rod that detects if the burner is lit after gas flows, preventing dangerous build-up if it cannot sense the flame. If the sensor becomes too …

In this video, I show you how to test a furnace flame sensor and properly diagnose flame sensing problems on a gas-fired furnace.

Mar 15, 2025 · When the furnace turns on, the gas valve opens to release fuel. The igniter lights the gas, creating a flame. The flame sensor detects heat and generates a small electrical …

Sep 3, 2025 · The flame sensor on a furnace is a metal rod positioned in the burner flame that detects the presence of flame via a small electrical current caused by flame rectification.

3 days ago · Restore your gas fireplace safety and operation. Diagnose flame sensor issues and learn when to clean or replace this critical component.

In this detailed tutorial, we will talk about what a flame sensor does, how it works, symptoms of a bad flame sensor, and how to clean or replace it. Homeowner, technician, or HVAC enthusiast …

Aug 7, 2025 · A flame sensor is a thin, heat-resistant metal rod positioned in the burner assembly of your gas furnace. It detects the presence of a flame during the heating cycle.

Nov 28, 2024 · A flame sensor is crucial for the safe and efficient operation of a furnace. It ensures that the furnace only operates when there is a flame present, preventing gas leaks …