Refrigeration Troubleshooting Fundamentals

Put gauges on a running system and read it: superheat on fixed-orifice equipment, subcool on TXV systems, the classic fault signatures (dirty evaporator, plugged condenser, low charge, overcharge, restricted metering device, failed reversing valve), combustion-side symptoms when the call is actually a furnace, and why 500 microns is the industry evacuation target. Pairs refrigeration systems with the gauge troubleshooting guide so diagnostics land on a root cause, not a guess.