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| Component | Failure Symptom | Diagnostic Step | Safety Risk |
|---|---|---|---|
| Cutter Blades | Humming but no pumping | Check for string/fiber wrap | Laceration from sharp edges |
| Float Switch | Constant cycling | Test continuity with multimeter | Electrical shock (240V) |
| Check Valve | Backflow into basement | Inspect for debris obstruction | Sewage exposure |
