Quick answer: The most common signs a transport refrigeration unit needs repair are failure to reach setpoint temperature, unusual noise from the compressor or fans, short-cycling (the unit switching on and off rapidly), ice buildup on the evaporator, and a temperature alarm that will not clear. Any of these signs means the unit needs inspection before the next loaded run.
A transport refrigeration unit does not fail without warning. In most cases, a fault that causes a breakdown in service was signalled days or weeks earlier. The cost of ignoring those signals is always higher than the cost of the repair.
This guide covers the common warning signs, what the typical faults are, what repairs cost in Australia, and when to call a technician rather than waiting.
Under the Australian Refrigeration Council’s ARCtick scheme, refrigerant handling must be performed by a licensed technician. This applies to recharging, recovering, and leak-testing the refrigerant circuit. A quote that does not include ARCtick-licensed labour for refrigerant work should be questioned.
Warning signs that a repair is needed
- Unit not reaching setpoint: The van or truck runs for 30 minutes but the cargo space does not reach the required temperature. Most commonly caused by low refrigerant, a dirty condenser, or a failing compressor.
- Short-cycling: The unit starts, runs for 60 to 90 seconds, then stops and starts again. This repeated pattern indicates a refrigerant pressure fault, a blocked filter drier, or an electrical control issue.
- Unusual noise: Rattling from the condenser unit, grinding from the compressor, or a high-pitched squeal from a drive belt that is worn or misaligned. Noise from a transport refrigeration unit is never normal. Every new sound has a cause.
- Ice on the evaporator coils: A thin layer of frost is normal. Heavy ice buildup that does not clear during a defrost cycle points to a defrost fault, a door seal failure allowing warm moist air to enter, or a blocked drain.
- Temperature alarm that will not reset: An alarm that clears and immediately returns means the underlying fault has not been resolved. Operating through an unresolved alarm risks cargo loss and compliance breach.
Most common faults and what causes them
| Fault | Most Common Cause | Risk if Left Unrepaired |
|---|---|---|
| Refrigerant loss | Worn seal, damaged line, fitting corrosion | Unit stops cooling entirely |
| Dirty condenser coils | Infrequent service, dusty operating environment | Reduced cooling capacity, compressor overload |
| Failed door seal | Age, repeated temperature cycling, physical damage | Temperature breach, ice buildup on evaporator |
| Compressor wear | Age, operating at high ambient, refrigerant contamination | Complete unit failure |
| Belt wear (direct drive) | Age, misalignment, infrequent inspection | Compressor stops, no cooling |
| Electrical fault | Wiring corrosion, blown fuse, failed relay | Unit will not start or short-cycles |
| Blocked filter drier | Moisture contamination in refrigerant circuit | System restriction, compressor damage |
What transport refrigeration repairs cost in Australia
Repair costs vary by fault type, unit brand, and parts availability. The figures below are representative of current Melbourne market rates at a quality workshop with ARCtick-licensed technicians.| Repair Type | Estimated Cost (Parts + Labour) |
|---|---|
| Refrigerant recharge (after leak repair) | AUD $250 to $550 |
| Refrigerant leak detection and repair | AUD $350 to $900 |
| Condenser coil clean | AUD $150 to $300 |
| Door seal replacement (per seal) | AUD $200 to $600 |
| Drive belt replacement | AUD $180 to $380 |
| Evaporator fan motor replacement | AUD $450 to $950 |
| Filter drier replacement | AUD $200 to $500 |
| Compressor replacement | AUD $1,800 to $5,000 |
| Electrical fault diagnosis and repair | AUD $200 to $850 |
Call a technician now vs wait for a scheduled service
Some faults can wait for the next scheduled service. Others cannot. The rule is straightforward: any fault that causes the unit to fail setpoint temperature during a loaded run must be repaired before the vehicle is used for another delivery.- Call now: unit not reaching setpoint on a loaded run
- Call now: compressor noise, grinding, or intermittent shutdown
- Call now: visible refrigerant leak (oil stain around fittings or lines)
- Call now: temperature alarm will not clear after reset
- Schedule at next service: minor condenser dirt, minor belt surface cracking, slight door seal compression
Frequently Asked Questions
How do I know if my refrigeration unit has a refrigerant leak?
The most reliable sign is a unit that slowly loses cooling capacity over days or weeks, not suddenly. An oily residue around refrigerant line fittings or the compressor is also a strong indicator. A certified ARCtick technician uses an electronic leak detector to confirm the location. Do not attempt to top up refrigerant without first finding and repairing the source of the leak.
Can I drive with a faulty transport refrigeration unit?
You can drive the vehicle, but you cannot operate it as a refrigerated transport vehicle. Under FSANZ Standard 3.2.2, food businesses are required to transport hazardous food at the correct temperature. Operating with a faulty unit that cannot maintain setpoint is a compliance breach. The vehicle can be driven to the workshop, but it should not carry perishable cargo until the fault is repaired.
What is the difference between a service and a repair?What is the difference between a service and a repair?
A service is preventive maintenance carried out to a schedule: cleaning coils, checking refrigerant levels, inspecting seals and belts, and verifying the unit holds setpoint. A repair is corrective work carried out in response to a specific fault. Consistent servicing reduces the frequency and cost of repairs by catching developing faults before they become failures.
How long does a typical transport refrigeration repair take?
A straightforward repair such as a belt replacement or condenser clean takes 1 to 3 hours. A door seal replacement takes 2 to 4 hours. A compressor replacement on a medium unit takes 4 to 8 hours. A refrigerant leak repair that requires pressure testing and recharge may take a full day, depending on the location of the leak. Auto Frigo provides a turnaround estimate at the time of diagnosis.
Does the 5-year Auto Frigo installation warranty cover repairs?
The 5-year installation warranty covers defects in the installation workmanship. It does not cover wear-related repairs, damage from misuse, or faults caused by lack of maintenance. The refrigeration unit manufacturer’s warranty (typically 2 years for Daikin units) covers unit component failures within the warranty period, subject to the unit having been serviced at required intervals. Check the warranty terms for your specific installation.
