How to Tell If Flame Sensor is Bad
There are a few telltale signs that something isn’t quite right with your furnace's flame sensor. If your gas furnace shuts down not long after turning it on, or if it shuts down before you shut it off completely, you may be dealing with a bad flame sensor.
Flame sensors are designed to check the gas valve of a furnace to make sure that it is only open when there is a fire. They are essential for health and safety as they stop harmful gases from accumulating. You normally find flame sensors in modern furnaces and other systems that use gas heating.
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