A fridge making a loud humming noise while failing to cool usually indicates a faulty evaporator fan motor or a compressor struggling to start due to a failed start relay. These components are essential for circulating cold air and managing the refrigeration cycle, so a malfunction in either will cause temperatures to rise and noise levels to increase.
When your fridge stops keeping your milk cold and starts sounding like a small aeroplane taking off, it can indicate an issue with one of the appliance’s components. Our technicians have experience diagnosing refrigerator faults across Melbourne, and the type and location of the noise can provide useful clues during diagnosis. If the noise is coming from inside the freezer, the evaporator fan may be involved. If it is coming from the back of the unit near the floor, the compressor or another component may be the cause.
Common Causes of Loud Noises and Cooling Failures
In the variable Melbourne climate, from the dry heat of mid-summer to the damp winters in suburbs like St Kilda or Glen Waverley, refrigerators work under different pressures. Here are the most frequent reasons for these symptoms:
1. Faulty Evaporator Fan Motor
The evaporator fan pulls air over the cooling coils and circulates it throughout the fridge. If the blades are obstructed by ice or the motor bearings are worn out, you will hear a loud chirping or humming. Because the air is not moving, the fridge stays warm even if the coils are freezing.
2. Defective Start Relay
The start relay is a small device plugged into the side of the compressor. It provide the “kick” needed to get the compressor running. If it fails, you may hear a repeated clicking or a loud hum followed by silence, while the compressor remains off and the fridge stays warm.
3. Condenser Fan Obstruction
Located at the back of the unit, this fan cools the condenser coils. In many Melbourne homes, especially older Victorian terraces with tight kitchen alcoves, dust and pet hair build up quickly. A blocked fan makes a loud grinding noise and leads to overheating, preventing the fridge from cooling efficiently.
Troubleshooting Guide: Noise vs. Symptom
Identifying the sound can help you determine if you need a simple cleaning or a professional part replacement.
| Sound Type | Likely Location | Potential Issue | DIY Fix? |
| High-pitched humming | Inside Freezer | Evaporator Fan | Inspect for ice |
| Clicking & heavy buzzing | Rear Bottom | Compressor / Relay | Professional Only |
| Vibrating/Rattling | Rear | Loose Drain Pan | Tighten screws |
| Grinding/Squealing | Rear Bottom | Condenser Fan | Clean debris |
How Melbourne’s Environment Affects Your Fridge
At Appliance Repairs Online, we have noticed that local factors play a significant role in appliance longevity. During a Melbourne heatwave, your fridge compressor runs significantly longer. If your kitchen lacks proper ventilation, heat builds up behind the unit, causing the condenser fan to work overtime and eventually fail.
We frequently visit clients near the coast in Brighton or Frankston where salt air can lead to slightly faster corrosion on electrical terminals compared to inland suburbs like Doncaster. Regular maintenance, such as vacuuming the coils every six months, is vital to prevent these “loud noise” scenarios from occurring during the peak of summer.
Step-by-Step Inspection Checklist
If you are facing a fridge making a loud humming noise and not cooling in Melbourne, follow these steps before calling a technician:
- Check the Power: Ensure the plug is firm and the circuit breaker has not tripped.
- Clear the Vents: Make sure items inside the freezer are not blocking the air vents.
- Inspect the Fan: If the noise stops when you open the freezer door, the evaporator fan is likely the issue.
- Clean the Coils: Pull the fridge out and vacuum the black coils and the fan area at the back.
- Listen for the Click: If you hear a click every few minutes but the fridge is warm, your compressor relay has likely burnt out.
When to Call a Professional Fridge Technician
While cleaning a fan may be a manageable maintenance task, electrical components and sealed refrigerant systems require professional handling. If you suspect a compressor fault or a refrigerant leak, it is best to contact a qualified appliance repair professional. At Appliance Repairs Online, our technicians have experience diagnosing and repairing refrigerators across Melbourne and can assess the appliance to identify the underlying issue and recommend an appropriate repair.
