Components
74 Field cases
- Liquid Refrigerant Entering Compressor (Flooded Start / Liquid Slugging)
- Compressor Motor Burnout / Ground Fault
- High Compressor Discharge Temperature (>107°C scroll, >120°C recip)
- Scroll Compressor Reverse Rotation — 3-Phase Miswiring
- Scroll Tip Seal Wear — Volumetric Efficiency Loss and Reduced Cooling Capacity
- Scroll Poppet Valve Fails to Close — Reverse Rotation Noise After Shutdown
- Digital Scroll Solenoid Failure — Loss of 15% Capacity Modulation
- Scroll Internal Liquid Slug — Tip Fracture and Scroll Volute Crack
- Semi-Hermetic Reciprocating Reed Valve Failure — Loss of Compression
- Reciprocating Piston Ring Wear — Increased Blow-By and Oil Dilution
- Reciprocating Connecting Rod Bearing Scoring — Insufficient Oil Pressure
- Reciprocating Unloader Solenoid Stuck — Part-Load Capacity Control Failure
- Reciprocating Crankshaft Oil Pump Shaft Wear — Oil Pressure Below 0.15 MPa Trip
- Rotary Compressor Vane Spring Failure — Incomplete Suction and Volumetric Efficiency Drop
- Rotary Cylinder-Rotor Clearance Wear — Internal Leakage Causing Capacity Loss
- Open-Drive Compressor Shaft Seal Leakage — Oil and Refrigerant Loss
- Open-Drive Compressor Belt Tension Incorrect — Belt Slipping or Bearing Overload
- Open-Drive Compressor Coupling Misalignment — Radial and Angular Offset
- Open-Drive External Motor Winding Overtemperature — Thermal Protection Trip
- Open-Drive Compressor Crankcase Oil Level Drop and Oil Foaming
- Rotary Discharge Reed Valve Fatigue Failure → High-Side Backflow
- Twin-Rotary Phase Synchronization Failure → Abnormal Vibration Increase
- Cooling Tower Outlet Water Temp 3°C Above Design — Approach Deterioration
- Air-Cooled Condenser Fin Damage — Reduced Airflow
- Water-Cooled Condenser Tube Scale/Sludge — High Condensing Pressure
- Evaporative Condenser Spray Nozzle Clogging — High Condensing Pressure
- Condenser Fan VFD Control Fault — Condensing Pressure Hunting
- Air-Cooled Condenser Reverse Pressure Differential — Short-Circuit Backflow
- Filter Drier Moisture Saturation
- Receiver Tank Overcharge
- Sight Glass Bubble Formation
- Receiver Safety Relief Valve Leakage
- Filter Drier Clogged — 3°C+ temperature drop across drier
- TXV Sensing Bulb Gas Loss — Valve Fully Closed
- TXV Orifice Moisture Freeze-Up — Intermittent Suction Pressure Drop
- EEV Stepper Motor Coil Open Circuit — Resistance Test 40–80Ω
- Capillary Tube Blockage — Small Hermetic Refrigerators
- TXV Superheat Maladjustment — Hunting or Liquid Slugging
- Oil Separator Internal Filter Clog — Excessive Discharge Pressure
- Oil Return Line Check Valve Seized — Compressor Fails to Start
- Centrifugal Oil Separator Efficiency Drop — Oil Carryover from High-Speed Discharge
- Float-Type Automatic Drain Valve Failure — Continuous Oil Discharge
- Oil Separator Heater Open Circuit — Liquid Slugging at Startup
- Missing Oil Trap on Vertical Riser — Oil Accumulation
- Undersized Suction Line — Excessive Pressure Drop
- Oversized Suction Line — Oil Return Failure at Low Load
- No U-Trap on Discharge Line — Oil Backflow at Shutdown and Liquid Slugging on Start
- Double Riser Not Applied — Oil Stagnation at Partial Load
- Discharge Pipe Resonance Fracture — Excessive Support Spacing
- Coastal Copper Pipe Galvanic Corrosion — Aluminum Fin Contact
- Suction Pipe Insulation Peeling — Condensation and Ceiling Water Leak
- Brazed Joint Cold Cracking — Residual Flux Corrosion
- Pipe Fatigue Crack — Stress Concentration at Rigid Bracket
- Solenoid Valve Coil Open Circuit — Pump-Down Failure
- 4-Way Reversing Valve Slug — Heat Pump Mode Switching Failure
- Check Valve Back-Flow — Condenser to Evaporator Leakage
- Ball Valve Internal PTFE Seat Wear — Partial Leakage
- Service Valve Schrader Core Leakage — Gas Release When Connecting Gauges
- Compressor Anti-Vibration Mount Hardening → Vibration Transmission
- Outdoor Fan Blade Ice Imbalance → Vibration 4 mm/s or Above
- Discharge Pipe Resonance Audible Noise (500–1000 Hz Band)
- Indoor Unit Blower Bearing Wear → Characteristic Frequency Peak in Spectrum Analysis
- Compressor Liquid Compression Low-Frequency Pulsation → Pipe Rumbling
- Superheat Too Low (<3°C) → Liquid Slugging Into Compressor
- Superheat Too High (>15°C) → Capacity Loss & Discharge Overheating
- Subcooling Insufficient (<3°C) → Flash Gas in Liquid Line → TXV Hunting
- Subcooling Excessive (>10°C) → High Condensing Pressure & Efficiency Loss (Overcharge Suspected)
- EEV Superheat Sensor Misplaced or Uninsulated → Erroneous SH Measurement
- VFD Fan/Pump Minimum Speed Set Too High → Excess Power Consumption
- Compressor Burnout After R410A→R32 Retrofit
- Oil Compatibility Failure During R22→R407C Conversion
- Gas Concentration Hazard Due to Poor Ventilation During R454B (A2L) Charging
- Existing Copper Pipe and Gasket Failure Due to R32 High-Pressure Incompatibility
- Mixed Refrigerant Charge Due to Identification Error — Missing Labels and No Analyzer Used