You open the fridge and feel warm air. The light is on, the motor is running — but nothing is staying cold. This is one of the most stressful appliance faults a Melbourne homeowner can face, especially when food safety is at risk.
The good news: a fridge that runs but doesn’t cool is almost always caused by a single repairable fault — not a need for a brand new appliance. Our fridge repair Melbourne team diagnoses and fixes these faults every day across all Melbourne suburbs.
This guide explains all 7 causes clearly, tells you what to check yourself in 5 minutes, and gives you honest 2026 pricing so there are no surprises.
3-Minute Self-Check Before Calling a Technician
Run through these three quick checks before booking a call-out — they occasionally solve the problem at no cost:
- Check the temperature dial: Has it been accidentally knocked to a warm setting? The fridge section should be set between 2°C and 4°C. The freezer should be at −18°C.
- Test the door seal: Close the fridge door on a piece of paper and pull it out. If it slides out easily, the seal has failed and warm air is entering constantly.
- Check for ice behind the back wall: Remove the bottom shelf and feel the back panel of the fridge. If it’s covered in ice or heavy frost, you have a defrost system fault — a very common and repairable issue.
If none of these explain the problem, one of the 7 causes below is responsible. Book our Melbourne fridge repair service for a same-day diagnosis.
The 7 Most Common Causes of a Fridge Not Cooling
Cause #1 — Dirty or Blocked Condenser Coils
The condenser coils at the back or underneath your fridge release heat from the refrigeration system. When they’re coated in dust and lint — which happens in most homes over 12–18 months — they can’t release heat efficiently. The fridge has to work much harder to cool, and eventually can’t reach the set temperature at all. This is the most common cause of a fridge not cooling properly and one of the easiest to fix.
- Fridge motor runs almost continuously without stopping
- Back or underside of the fridge feels very warm or hot to touch
- Fridge is 2+ years old and has never been serviced
Cause #2 - Failed Evaporator Fan Motor
The evaporator fan is inside the freezer compartment. Its job is to circulate cold air from the freezer into the fridge section. When this fan stops working, cold air stays trapped in the freezer while the fridge section warms up — a very common scenario where the freezer still works but the fridge above doesn’t cool.
- Freezer is cold but the fridge section above isn’t
- No airflow can be felt from the fridge vents
- Unusual noise from inside the freezer compartment (grinding or squealing)
Cause #3 - Defrost System Failure (Frost Buildup)
Modern frost-free fridges run a short automatic defrost cycle every 6–8 hours to prevent ice buildup on the evaporator coils. If the defrost heater, defrost thermostat, or defrost timer fails, ice accumulates on the coils and completely blocks all airflow — the fridge stops cooling even though the compressor and fan are running perfectly. This is one of the most misdiagnosed fridge faults.
- Heavy ice or frost visible on the back wall inside the fridge compartment
- Fridge cools intermittently — works for a day, then fails again
- Loud humming that stops when frost builds up and airflow is blocked
Cause #4 - Faulty Thermostat or Temperature Sensor
The thermostat monitors the internal temperature and tells the compressor when to start and stop. A faulty thermostat may fail to signal the compressor to turn on, leaving the fridge at room temperature despite appearing fully operational. On newer electronic models, a failed temperature sensor can give incorrect readings that cause the same result.
- Fridge is consistently warmer than the dial setting indicates
- Compressor never turns on — no hum or vibration felt at the base
- Temperature fluctuates widely even without frequent door opening
Cause #5 - Worn or Damaged Door Seal (Gasket)
The rubber door seal creates an airtight barrier when the fridge is closed. Over time it cracks, stiffens, or loses its magnetic grip. A failing door seal allows warm Melbourne air to constantly seep into the fridge, forcing the compressor to work continuously without ever fully cooling the interior. This fault is extremely common in fridges over 5–6 years old and is one of the cheapest fixes available.
- Paper slide test: paper slides freely when door is closed
- Visible cracks, tears, or gaps in the rubber seal
- Condensation forming on the outside of the door or door frame
- Fridge runs almost constantly but temperature never drops to the set point
Cause #6 - Refrigerant Leak
Refrigerant is the gas that absorbs and transfers heat through the refrigeration system. A slow leak causes a gradual loss of cooling capacity over days or weeks — the fridge may feel slightly cool but never cold enough to safely store food. Refrigerant leaks are less common than other faults but do occur, particularly after the fridge has been moved or in units over 8 years old.
- Fridge gradually getting warmer over a period of weeks
- Both fridge AND freezer losing cooling ability simultaneously
- Hissing or bubbling sound from the back of the unit
- Oily residue visible near the compressor or pipe connections
Cause #7 - Compressor Failure
The compressor pumps refrigerant around the cooling circuit. When it fails, the fridge cannot cool at all. Compressor failure is the most expensive fridge repair and is more common in units over 10 years old. Importantly: many fridges are misdiagnosed as having compressor failure when the real fault is a $25 start relay or blocked coils. A proper technician rules out all other causes first.
- Fridge is completely silent — no motor hum or vibration at all
- Fridge light works but zero cooling in both fridge and freezer
- Loud clicking as the compressor tries to start but fails repeatedly
- Fridge is 12+ years old with a history of intermittent cooling issues
Conclusion
A fridge that runs but doesn’t cool is caused by one of seven specific, diagnosable faults — from a $90 coil clean all the way to a compressor replacement. In most cases, the fix is simpler and cheaper than homeowners fear. The key is getting a proper multi-point diagnosis from a licensed technician who rules out the simple causes first.
DP Electric Appliance provides fridge repair across Melbourne with same-day bookings, transparent pricing, and a 90-day warranty on every repair. Also see our guide to common appliance problems Melbourne homeowners face for tips on other appliances.
Frequently Asked Questions
Fridge Not Cooling in Melbourne?
DP Electric provides same-day fridge repairs across all Melbourne suburbs. Upfront pricing, 90-day warranty, licensed technicians.
Author bio
Dishank Patel
He is a highly experienced appliance repair specialist and the founder of DP Electric. With a strong commitment to quality service, he provides reliable home appliance repair solutions across Melbourne. From dishwashers and dryers to ovens, cooktops, Refrigerator, washing machines, and air conditioners, Dishank ensures that every repair is handled with precision and efficiency.
Passionate about customer satisfaction, Dishank focuses on delivering prompt and professional service, ensuring appliances function at their best. With years of expertise in diagnosing and fixing a wide range of household appliances, he has built a reputation for excellence and trust in the industry.