HVAC DIY Tips & Tricks

Troubleshooting a Furnace Pressure Switch

stay comfortable with phyxter home services

- By Jake Gibson

Don't let a faulty furnace pressure switch ruin your winter! Learn how to troubleshoot and fix the issue with our step-by-step guide.  Keep your home warm and comfortable with our expert advice.

What Does a Pressure Switch Do?

A furnace pressure switch is used in a furnace to confirm that the draft inducer motor is effectively removing all of the products of combustion from the heat exchanger.

Purpose of Your Furnace’s Pressure Switch

The purpose of a furnace pressure switch is to sense a specific pressure difference when the inducer motor is running.

Purpose of Your Furnace’s Pressure Switch

The pressure difference can be affected by draft inducer motor failure, venting issues, heat exchanger issues, and condensate drain issues.

How to Test a Furnace Pressure Switch

You’ll need to attach the manometer to the tubing on the furnace pressure switch to get a reading when the draft inducer motor is running.

Types of Furnace Pressure Switches

There are a few different types, from single-stage conventional to two-stage condensing furnace pressure switches. Check your furnace type.

Troubleshooting a Furnace Pressure Switch

You going to want to read and understand the sequence of operations for the furnace heating cycle before troubleshooting.

Hit Swipe Up! to read the full article to learn more about your furnace and manage your home like a professional.