How to Tell If Flame Sensor is Bad - Furnace Repair and ...
Jun 3, 2025 · Signs of a bad furnace flame sensor are: This guide explains how to troubleshoot a bad flame sensor. This part does exactly what it says – senses flame to ensure the furnace has fired. If a …
A Complete Guide to Furnace Flame Sensors - hvac.com
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.
Understanding the Different Parts of a Furnace
Feb 2, 2025 · Flame sensor and igniter The flame sensor and hot surface igniter on a gas furnace can become coated with black carbon deposits and fail to work properly. These are relatively easy parts …
Gas Furnace Flame Sensor: How It Works, Troubleshooting, and ...
Oct 9, 2025 · The flame sensor operates on the principle of flame rectification or ionization. When a flame is present, ions in the flame create a small electrical current between the flame sensor rod and …
Clean Your Furnace Flame Sensor or Lose Heat, Pros Warn ...
Dec 5, 2025 · 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 dirty, it …
How a Flame Sensor Works: From Detection to Output
A flame sensor is an electronic device engineered to confirm the presence or absence of combustion within a monitored area. Its primary function is to detect the specific electromagnetic radiation or …
Flame Sensor : Working, Types, Interfacing & Its Applications
Nov 5, 2022 · A flame-sensor is mainly used to detect & react to the occurrence of a flame/fire. Flame sensors are used in fire alarms, fire detection, drying systems, fire fighting robot, industrial heating, …