That’s where the pressure switch comes in handy. However, there must be a mechanism to verify that the draft inducer is working perfectly, right? Otherwise, you’d be banking on guesswork. They can cause shortness of breath and even asphyxiation.įurnaces deploy a draft inducer motor/fan to remove these gases from the furnace and outside the house. Pretty much all these gases are poisonous in large quantities. Carbon dioxide, carbon monoxide, nitrogen dioxide, and sulfur dioxide are just a few examples. You see, during combustion, the furnace burns fuel (natural gas, propane, etc.) and oxygen, producing several byproducts, some of which are poisonous gases. The pressure switch is a specialized circuit built into the furnace to protect you and your family from the backdraft of exhaust gases. What’s the Pressure Switch and What Does it Do? It’s a sign that the pressure switch is open when it should be closed. This applies to nearly all furnaces unless the manufacturer says otherwise. If your furnace flashes three times, it’s a sign that it has an issue within the pressure switch circuit. What could be wrong, and how can you fix it? Also, can you fix it yourself, or do you need to call the pros? Let’s find out. Additionally, you’ve noticed that it flashes three times – as if to warn you. Maybe it blows cold air, i.e., the fan seems to run, but it’s not heating the house. You’re just from work and, because of the freezing conditions, the first thing you do when you get to the house is to reach for the furnace switch.
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