![]() It ensures an airtight connection to prevent external interference in the pressure building inside the switch. The hose that connects to the pressure switch is a port specially designed to prevent air leakage. So, if you notice cuts or other damage on the hose, the switch might be compromised. However, the rubber parts tend to wear slowly with age, the nylon hose connecting the switch to the inducer housing being the biggest culprit. The pressure switch doesn’t wear or get damaged too often since 90% of it is metal. However, since the exhaust fan may be running already, you’ll still probably get air from your ducts. Furnace Blows Air at Room TemperatureĪs we saw earlier, the furnace won’t run if you have a bad pressure switch. ![]() If it’s missing, your pressure switch is not opening. The clicking happens when the gas valve opens and is the ultimate sign that your pressure switch is OK. The first sign that you have an issue with your pressure switch is a missing “click” sound when igniting the furnace. These include No “Click” Sound at Ignition ![]() The good news is that there are bad furnace pressure switch symptoms and tell-tale signs that you can easily spot. When this happens, the furnace may refuse to run, or if it does, it will usually run without producing heat.Īs a result, the air coming out of the ducts will be at room temperature or slightly colder due to the breeze. Unfortunately, the pressure switch can become defective and refuse to work. How Do I Know if the Pressure Switch is Bad? This way, it protects you and your family/guests from poisoning. More importantly, when the pressure switch is open, it suspends furnace operation, preventing further production of exhaust gases. However, if it refuses to close, i.e., stays open, you immediately know that there’s a problem with the combustion gas exhaust process, but you have to know where the pressure switch is located. As long as it’s closed, you can rest easy knowing that there’s no risk of poisoning from backdraft. It essentially tells you that combustion gases are moving out of the furnace smoothly. That’s where the pressure switch comes in handy. However, there has to be a way to tell that the inducer motor removes the exhaust gases, right? More specifically, there needs to be a way to check whether the said gases are moving outside the house and not back into the house (back-drafting). The blowing fan directs the gases out of the furnace and outside the house. All of these gases can cause poisoning and asphyxiation in large quantities.įurnaces depend on the draft inducer fan to vent the gases. These include carbon dioxide, carbon monoxide, and sulfur dioxide. The furnace produces lots of waste/combustion gases during the combustion process. The pressure switch is a relay type of circuit designed to protect your loved ones from a dangerous backdraft of combustion gases. What’s a Pressure Switch and What Does it Do? Image: We also touch on several other things you may want to know about furnace pressure switches, so you’re fully prepared in case of an emergency. But, ultimately, it’s easier to fix than one stuck open.īelow we discuss everything you need to know about “stuck closed” pressure switches and what you can do about the issue. You’ll need a few tests to verify that the unit is stuck. A furnace pressure switch stuck in a closed position isn’t as common as “stuck open” cases.
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