Field Diagnostics
Solve harder problems, faster.
Field-tested HVAC troubleshooting and diagnostic frameworks for the toughest service calls: airflow diagnostics and static pressure, electrical troubleshooting and wiring diagrams, refrigerant and compressor faults — built from more than 20 years of real field experience.
Reading order
Start with book one and continue straight into the next.
Titles in this series
The Complete HVAC Troubleshooting System
Diagnose Faster. Stop Guessing. Fix It Right the First Time.
A complete diagnostic system built on 20+ years of hands-on HVAC experience — engineered to help technicians diagnose faster, stop guessing, and fix it right the first time.
Stop Guessing: HVAC Airflow Made Simple
Understand Airflow. Measure It Correctly. Diagnose Problems with Confidence.
A practical field guide that helps HVAC technicians understand airflow, measure system performance correctly, diagnose restrictions, and solve comfort problems with confidence.
Stop Guessing: HVAC Airflow Made Simple — Advanced Airflow Diagnostics — Volume 1
Advanced Field Measurements, Static Pressure, CFM, Cooling, Heating, Blower Motors, and System Performance
Move beyond basic airflow. Learn how to measure, interpret, and connect the operating numbers that reveal what the complete HVAC system is doing.
Stop Guessing: HVAC Airflow Made Simple — Advanced Airflow Diagnostics — Volume 2
Compressors, Refrigerant Diagnostics, Superheat, Subcooling, Decision Trees, Case Studies, and Professional HVAC Troubleshooting
Transform measurements into reliable diagnostic decisions. Follow complete-system evidence, identify the true root cause, and verify every repair.
Stop Guessing: HVAC Electrical Wiring Made Easy
Learn to Read, Diagnose, Troubleshoot, and Wire HVAC Electrical Circuits with Confidence
A field-tested guide that teaches HVAC technicians how to read wiring diagrams, diagnose electrical faults, troubleshoot controls, and wire HVAC circuits safely and with confidence.
Free field guides for this series
Read the free guides first, then go deeper in the books above.
- How to Troubleshoot an HVAC System, Step by StepThe order you check things in decides how long the call takes. Here is the sequence that keeps you from chasing the wrong fault.Read the guide
- Static Pressure in HVAC: How to Measure TESP and Read ItTotal external static pressure is the single fastest measurement for telling you whether a system can move the air it was designed to move.Read the guide
- CFM per Ton: How Much Airflow a System Actually Needs400 CFM per ton is where the conversation starts, not where it ends. The right target depends on climate, coil and what the system is being asked to do.Read the guide
- HVAC Electrical Troubleshooting: Reading a Wiring DiagramA wiring diagram is a map of where voltage is supposed to be. Troubleshooting is finding the first place it is not.Read the guide
- Superheat vs Subcooling: When to Use EachTwo readings, two different questions. Using the wrong one is how correctly charged systems end up overcharged.Read the guide
- AC Running but Not Cooling: What to Check, In OrderA system that runs without cooling is rarely a mystery. It is almost always airflow, charge, or load — checked in that order.Read the guide