Furnace Pressure Switch Replacement

If your furnace isn’t working due to pressure switch failure, you need to install a new one. If you have no experience with furnace pressure switch replacement, that’s OK. It’s a job so easy that any novice do-it-yourselfer can handle it. Follow the steps outlined here, and you’ll have your HVAC system working in no time. Understanding setup is vital to getting the most out of it. Let’s start with the basics.

How to Replace a Furnace Pressure Switch

  1. Cut the power to the furnace.
  2. Disconnect the pressure switch (wiring and hose).
  3. Now you can remove the switch from the bracket. If your new pressure switch has a bracket attached, it’s probably easier to remove the bracket with the old switch.
  4. Install and secure the new switch.
  5. Reconnect the hose and then the wiring to the pressure switch.
  6. Reconnect the power to the furnace.
replacing the furnace pressure switch

Furnace Pressure Switch Symptoms

If your pressure switch is compromised, then your furnace will not startup. Keep in mind that this doesn’t necessarily mean the pressure switch is broken. It might be shutting things down because the furnace is vented properly. If it is indeed the pressure switch, there are a few different sources to consider creating the problem. Check for a clogged hose port or a cracked hose between the draft inducer motor and pressure switch. Another culprit to look out for is a compromised diaphragm. It simply may be jamming because of too much dirt and dust buildup. Lastly, your pressure switch may be too old.

How to Test a Furnace Pressure Switch

In order to test the pressure switch, you need to jump or bypass the pressure switch. Once you’ve done that, you can run your furnace to see that it’s venting properly. If it is, then you know the issue is with a bad switch that needs replacement.

Buy Discount Furnace Pressure Switches

Now that you know how to replace a furnace pressure switch, you need a new one for the job. If you don't have one already, go ahead and buy a pressure switch at PlumbersStock. We have reliable manufacturers and affordable pricing when it comes to HVAC switches. Be sure to come here first whenever you need HVAC parts. Did you know that you can find member pricing here on certain items (typically name brand, MAP priced items) if you log in? For industry professionals buying in bulk, please consider contacting us directly for extra special pricing and extra savings.

Related resources:
How to Bypass Furnace Pressure Switch
Furnace Pressure Switch Stuck
What Is a Pressure Switch?

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