The Anatomy of a Reefer Container
- Compressor — Heart of the system, compresses refrigerant gas
- Condenser coil — Releases heat from refrigerant to outside air
- Evaporator coil — Absorbs heat from inside the container
- Control board — Manages temperature, defrost cycles, alarms
- Temperature sensors — Monitor return air, supply air, and ambient conditions
- Filter drier — Removes moisture and contaminants from refrigerant
Part 1: Compressors
The compressor is the most critical and expensive component in a reefer unit.
Signs of Compressor Failure
- Unit runs but no cooling — Compressor not pumping
- Loud knocking or rattling — Internal mechanical damage
- High amp draw — Worn bearings or electrical issues
- Burned oil smell — Internal short circuit
Maintenance Tips
- Check oil level and condition every 500 operating hours
- Monitor amp draw — sudden changes indicate problems
- Keep condenser coils clean to reduce compressor workload
Part 2: Evaporators
The evaporator absorbs heat from inside the container. Warm air passes over the coil, refrigerant absorbs the heat, and cold air returns to the cargo space.
Common Issues
- Ice buildup — Dirty coils, low refrigerant, or defrost heater failure
- Poor airflow — Dirty or damaged evaporator fan
- Refrigerant leak — Corrosion or vibration damage
Part 3: Control Boards and Electronics
Modern reefer containers use microprocessor control boards to manage temperature regulation, defrost scheduling, alarm monitoring, and data logging.
Signs of Control Board Failure
- Display shows gibberish or blank
- Unit ignores temperature setpoint
- Constant false alarms
- Unit randomly shuts off
Part 4: Sensors and Thermostats
Types of Sensors
- Return air sensor — Monitors temperature of air leaving cargo space
- Supply air sensor — Monitors temperature of air entering cargo space
- Ambient sensor — Monitors outside temperature
- Defrost sensor — Detects ice formation for defrost cycle
OEM vs Aftermarket Parts: Why It Matters
- OEM lifespan: 8–12 years typical
- Aftermarket lifespan: 6–24 months common
- OEM warranty: Full manufacturer warranty
- Aftermarket warranty: Limited or none
A $200 aftermarket compressor might save money today, but when it fails in 9 months, you pay for the part again plus labor, plus cargo loss. OEM pays for itself.
Signs Your Reefer Needs Immediate Servicing
- Temperature swings greater than +/-2°C from setpoint
- Unusual noise from compressor or fans
- Ice buildup on evaporator coils or inside container
- Alarm codes displayed on control panel
- Visible oil stains around compressor or fittings
Don't wait for complete failure. Preventive servicing costs 80% less than emergency repairs plus cargo claims.
AML's Reefer Machinery Parts and Servicing
Since 2005, Advance Marine & Logistics has been a trusted supplier of genuine reefer machinery parts across Singapore and the Far East region.
Parts Supply
- OEM compressors (Carrier, Thermo King, Daikin)
- Control boards for all major brands
- Complete sensor and fan motor inventory
- Expansion valves, filter driers, and defrost heaters
Servicing and Repair
- Preventive maintenance contracts
- Emergency breakdown response (24/7)
- Compressor change-outs and system flushing
- Leak detection and refrigerant recharge
Genuine Reefer Machinery Parts in Stock Now
Reach our team at sales@aml.sg or via WhatsApp: +65 8268 3359.
Enquire with us today at https://aml.sg
