Topic cluster
HVAC Troubleshooting, Airflow Diagnostics & Electrical Troubleshooting
Three skills solve most field problems: a disciplined troubleshooting sequence, accurate airflow diagnostics, and confident electrical troubleshooting. Start with a free field guide, then go deeper with the book series built around each topic.
HVAC Troubleshooting
A repeatable troubleshooting sequence beats guesswork on every service call. These resources walk through the same step-by-step diagnostic order used in the field — from the first symptom to the confirmed fault.
Field guides
- How to Troubleshoot an HVAC System
The full field sequence, symptom by symptom.
- AC Not Cooling? Start Here
The most common call, diagnosed in the right order.
Book series
- Field Diagnostics Series
Five books on complete system troubleshooting, led by The Complete HVAC Troubleshooting System.
- Colección Morales (Español)
El mismo método de diagnóstico, escrito en español para técnicos en Estados Unidos.
Airflow Diagnostics
Most comfort complaints trace back to airflow. These guides cover the measurements that matter — static pressure and CFM per ton — and the book series that turn them into a repeatable diagnostic method.
Field guides
- How to Measure Static Pressure
The reading that reveals hidden airflow problems.
- CFM per Ton: The Airflow Chart
Target airflow by system size, and how to verify it.
- Superheat vs. Subcooling
What these readings say about airflow and charge.
Book series
- Field Diagnostics Series
Includes HVAC Airflow Made Simple and Advanced Airflow Diagnostics Volumes 1–2.
- Colección Morales (Español)
Diagnóstico de flujo de aire simple y avanzado, completamente en español.
Electrical Troubleshooting
Electrical faults stop more systems than any refrigerant issue. Start with wiring-diagram basics, then follow the series that build real electrical troubleshooting skill from the fundamentals up.
Field guides
- How to Read HVAC Wiring Diagrams
The foundation of every electrical diagnosis.
- HVAC for Beginners: The Learning Roadmap
Where electrical training fits in the bigger picture.
Book series
- Field Diagnostics Series
Closes with HVAC Electrical Wiring Made Easy for in-depth electrical troubleshooting.
- First Principles Series
Five volumes covering HVAC fundamentals, components and safe troubleshooting basics.
Browse everything
See the full English HVAC catalog, the Spanish catalog, or every field guide in one place.