HVAC
Refrigeration Troubleshooting
Diagnosing charge, airflow, and component problems on residential and light commercial refrigerant systems using manifold gauges, superheat, and subcool measurements. Covers reading the numbers to distinguish undercharge, overcharge, restricted metering device, dirty coil, and failing compressor, then confirming the root cause before condemning parts.
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Learning Paths
Choose a path that matches your experience level and work toward mastery at your own pace.
Beginner Friendly
1 path
Start here
Learn to take pressure, superheat, and subcooling readings on a refrigerant system and what each reading tells you about charge, airflow,...
Intermediate
1 path
Put gauges on a running system and read it: superheat on fixed-orifice equipment, subcool on TXV systems, the classic fault signatures (d...