Walkin Cooler at 65F, Blown Fuse, A bad capacitor or a short? Let's Find Out

Troubleshooting a Walk-In Cooler: Blown Fuses, Bad Capacitors, and Emergency Repairs
In HVAC systems, blown fuses are a common issue, but they rarely fail without an underlying problem. In this video, I troubleshoot a no-cooling call for a walk-in cooler and uncover the root causes.
Blown fuses often result from shorts or bad capacitors. Following a systematic approach, I traced the issue wire by wire, discovering both a bad capacitor and a burnt wire at a wire nut. The big question: Did the bad capacitor cause the wire to overheat, or did the overheated wire damage the capacitor? Fortunately, I caught the bad capacitor before it could destroy the compressor-because a faulty capacitor can lead to compressor burnout.
This situation highlights a common challenge: many restaurants operate on tight budgets and neglect regular maintenance. Had the customer accepted a maintenance plan, we could have detected the bad capacitor earlier and likely avoided this Friday emergency repair, just before a storm hit.
Toward the end of the video, one of my students joins me, and we discover the system is low on R404 refrigerant with high superheat. I contacted the customer to recommend adding refrigerant and enrolling in a maintenance program, but they declined.
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Good job