A residential package-unit heat pump has no air flow. The cause? Well, there are a few possibilities and it will take some effort to find the culprit. Presented by Jim Johnson, a well-regarded instructor and an expert in HVAC/R and electrical system repair, this video serves as a guide to troubleshooting the job. It shows how to determine whether or not the indoor air handler is the source of the problem or if it’s a control component that is not allowing the blower motor to run. Trainees also learn how to replace the blower motor with an OEM component (or, with some adapting work, a general replacement motor) and to assemble the tools and test equipment needed in order to troubleshoot properly. A viewable/printable resource guide is available online and used throughout the program to demonstrate the use of wiring diagrams. By following along as Jim navigates each diagram, viewers are able to identify all relevant components of the unit and isolate the malfunctioning part.