What Can Cause a Furnace Pressure Switch to Fail?
The pressure switch in a gas furnace is an important safety mechanism that ensures the furnace is drafting correctly. If the furnace doesn’t draft properly, it leads to dangerous combustion fumes being trapped inside the combustion chamber and heat exchanger instead of being vented outside. This can cause carbon monoxide to leak into your home. The fumes can also cause a delay before the furnace ignites, producing a small explosion or starving the flames of oxygen so that they escape or “roll out” of the combustion chamber. The pressure switch on your furnace can fail due to various issues. The pressure switch itself can sometimes wear out and fail to activate, but more commonly, it will stop working due to some other problem with the furnace. If the pressure switch ever fails, it will prevent the furnace from being able to start. Let’s now take a closer look at how the pressure switch works and what can cause it to fail. How a Furnace Pressure Switch Works A pressure switch is like any other switch; it makes a connection to allow electricity to flow across it. The pressure switch is activated or closed by the furnace’s inducer fan, which then...
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