Common HVAC Failures & Troubleshooting Method | Lesson 4.4

This is the final lesson of the HVAC chapter — and the one that pulls everything together. Any engineer can swap a part. A good engineer finds out what's actually wrong first. In this lesson you will learn a structured 9-step troubleshooting method, plus the failure patterns behind most HVAC complaints — explained the way it works on site, not just in theory. In this lesson: The trap every new engineer falls into: replacing parts before diagnosing Why a structured method is faster, cheaper, and builds real system understanding The 9-step process: Symptom, Possible Causes, Inspection, Testing, Diagnosis, Corrective Action, Verification, Root Cause Analysis, Preventive Action Writing the symptom precisely: "office too warm", not "AC broken" Why listing possible causes first stops tunnel vision Chiller failure patterns: repeated refrigerant top-ups mean a leak; high-pressure trips usually start at the condenser or cooling tower AHU & FCU patterns: check the filter, control valve and condensate drain first Pump patterns: running but no flow, and tripping on overload Controls patterns: check the BMS trend before suspecting the machine A site example: the warm conference room, worked through all nine steps — one fix that actually holds Four troubleshooting mistakes to avoid FM manager tip: make root cause analysis a habit on small faults, and you'll prevent the big ones That completes Chapter 4. Next: Chapter 5 — Electrical Systems Deep Dive. #TheFMMentor #FacilitiesManagement #HVAC #Troubleshooting #Chiller #AHU #RootCauseAnalysis #BMS #BuildingServices #FMcareers