Refrigeration systems
128 Field cases
- Aging Room Humidity Control Failure (Unable to Maintain 85~95%RH)
- Ethylene Buildup in Meal Kit/Produce Warehouse — Over-Ripening Due to Ventilation Failure
- End-Zone Temperature Rise (Uneven Cooling)
- Air Curtain Weakening
- Excessive Temperature Rise After Defrost
- Excessive Heat Load from Direct Sunlight or Lighting
- Temperature Rise Due to Overloading Beyond Load Limit
- Excessive Evaporator Icing
- Defrost Heater Wire Break
- Defrost Termination Sensor Malfunction
- Frost or Water Droplets on Products
- Excessive Condensation from Not Using Night Cover
- Evaporator Fan Motor Burnout
- Condenser Fan Motor Failure
- LED Lighting Failure
- Hinge/Spring Wear — Automatic Door Closing Failure
- Double-Pane Glass Condensation (Internal Frost in Insulated Glazing)
- Defrost Water Drainage Blockage
- Evaporative Drain Fan Failure
- Electronic Controller (Dixell/Eliwell) Parameter Loss or Probe Error
- Partial Case Malfunction in Multi-Case Serial Network — Common Control Line
- 3-Phase Power Phase Loss/Voltage Imbalance — Compressor Overload Trip
- Hot Gas Defrost 4-Way Valve Fails to Shift → No Defrost
- Electric Heater Defrost Overtime → Evaporator Thermal Shock and Case Deformation
- Defrost Timer Interval Too Long → Increasing Frost Thickness
- Defrost Termination Sensor Failure → Premature or Excessive Defrost
- Drain Pan Heater Not Working → Drain Line Ice Blockage
- Power Supply Fault
- Start Capacitor Failure
- Compressor Internal Failure
- Thermostat / Controller Failure
- Magnetic Contactor Failure
- Wiring Fault / Open Circuit
- Compressor Seizure / Lock-up
- Thermal Overload Protector Tripped
- No Cooling Due to Compressor Not Running
- No Cooling Due to Refrigerant Leak
- Expansion Device Blockage (TXV / Capillary Tube)
- Airflow Blocked by Excessive Frost Buildup
- Reduced Cooling Capacity Due to Condenser Fouling
- Reduced Cooling Capacity Due to Low Refrigerant Charge
- Cold Air Leakage Due to Faulty Door Seal/Gasket
- Excessive Cooling Load
- Compressor Anti-Vibration Mount Failure or Resonance
- Compressor Internal Bearing Wear or Oil Shortage
- Compressor Discharge Valve Leak Sound
- Evaporator Fan Blade Contacting Frost
- Evaporator Fan Motor Bearing Wear
- Condenser Fan Blade Deformed or Contacting Casing
- Condenser Fan Motor Bearing Wear
- Liquid Refrigerant Hammering (Liquid Hammer)
- Pipe Vibration / Resonance
- Immediate Trip Due to Ground Fault (Insulation Breakdown)
- Immediate Trip Due to Wiring Short Circuit
- Overcurrent at Start (Starting Device Failure)
- Start Capacitor Failure Causing Startup Overcurrent
- Intermittent Insulation Fault / Loose Terminal
- Motor Overload Due to Elevated Condensing Pressure
- Compressor Motor Overload (Winding Fault)
- Partial Frost Due to Expansion Device Abnormality
- Suction Pipe Frosting from Low Superheat
- Defrost Heater Open Circuit / Failure
- Re-frosting Due to Blocked Defrost Drain
- Defrost Timer / Controller Failure
- Short Cycling from High Pressure Protection Activation
- Short Cycling from Low Pressure Protection Activation
- Short Cycling from Overload Protector Activation
- Premature Cutoff from Thermostat Sensor Misplacement
- Malfunction Due to Control Board (PCB) Failure
- High Pressure Rise from Condenser Fan Stoppage
- High Pressure Rise from Condenser Fouling
- High Pressure Rise from Refrigerant Overcharge
- Non-Condensable Gas (Air) in Circuit
- Low Pressure Drop from Excessive Evaporator Frost
- Low Pressure Drop from Refrigerant Leak
- Low Pressure Drop from Expansion Valve Blockage / Closure
- Low Pressure Drop from Evaporator Fan Failure
- Fan Motor Control Signal Failure (PCB / Relay)
- Evaporator Fan Motor Burned Out / Faulty
- Fan Temporarily Stopped During Normal Defrost (Normal)
- Fan Power Wiring / Fuse Failure
- Condenser Fan Power Wiring / Contact Failure
- Fan Blade Jammed by Foreign Object or Bearing Seizure
- Condenser Fan Motor Burned Out / Faulty
- Condensate Around Condenser (Normal or Drain Issue)
- Condensate from Poor Pipe Insulation
- Drain Pan Contamination / Blockage
- Drain Hose / Pipe Blocked or Kinked
- Drain Pump Failure or Not Installed
- Distribution Panel Breaker Off or Tripped
- Partial Operation - Incomplete Power or Communication Error
- Internal Fuse / Miniature Circuit Breaker Blown
- Main PCB (Control Board) Failure
- Compressor Overheating from High Condensing Pressure
- Compressor Overheating from Excessive Suction Superheat
- Compressor Cooling Failure (Insufficient Motor Cooling Gas)
- Overcurrent and Overheating from Low Voltage
- Refrigerant Overcharge or Compressor Bearing Wear
- Motor Cooling Failure from Low Refrigerant → Overheating
- Poor Condenser Heat Rejection → Repeated Overheating Trip
- Oil Shortage (Low Oil Level)
- Low Oil Pressure from Overly Open Pressure Regulating Valve
- Oil Pump Failure
- Refrigerant Dissolved in Oil → Oil Foaming at Startup
- Valve Partial Failure Causing Re-compression and Oil Overheating
- Oil Contamination (Carbonization or Metal Particles)
- Ice Blockage of Expansion Device Confirmed (Moisture Freeze)
- Debris Blockage (Sludge or Welding Residue)
- Severe Moisture Ingress (Repeated Drier Blockage)
- Acid Contamination (Post Motor Burnout Circuit Contamination)
- TXV Sensing Bulb Poor Contact
- TXV Hunting Due to Fluctuating Load
- TXV Internal Defect (Diaphragm or Spring Fault)
- TXV Blockage (Debris or Moisture Ice)
- TXV Over-closure from Spring Over-tension or Bulb Gas Loss
- Refrigerant Overcharge or TXV Over-opening
- Compressor does not start
- Compressor thermal trip repeats
- Cooling temperature does not reach setpoint
- Excessive frost buildup on evaporator
- Abnormal noise from compressor
- Noise from condenser (outdoor unit) fan
- Refrigerant shortage (low suction pressure)
- Circuit breaker keeps tripping
- Electronic expansion valve (EEV) not responding
- Controller (board) displays error code
- R-134a refrigerant handling — medium-temp & automotive (A1)
- R-290 (propane) handling — flammable A3 safety rules