Does all of the equipment in your HVAC equipment appear to be working properly, but you have no airflow? Is your furnace turning on and then turning off before any air is blown into your home? Does your air conditioner turn on, but no air coming through the vents causing it to freeze up? These are all very common issues that many times are related to the blower not operating properly. How do you know for sure the furnace fan blower motor is actually bad and not another component. 

This guide will help you determine if the furnace fan blower motor has actually failed or help you rule out its failure. This guide only covers Permanent Split Capacitor (PSC) Motors and does not provide information on troubleshooting ECM and variable speed motors. 

Don't just replace your motor because there is not air coming from your vents. Use this guide to determine and ensure the motor has actually failed and save yourself money as a result. 

It this guide is not sufficient in troubleshooting your blower/air flow issues, try the Easy Furnace Fix-It Guide: Simple Furnace Diagnostic Repair Guide for Homeowners for more detailed diagnostics and electrical troubleshooting.