Fridge Running All the Time? Why Your Refrigerator Runs Constantly and How to Fix It

Quick answer: A fridge running all the time is usually caused by dirty condenser coils, a faulty condenser or evaporator fan, worn door seals, a failing thermostat or temperature sensor, a defrost system fault, or a refrigerant leak. Some constant running is normal, for example in hot weather or after loading fresh groceries. If the compressor hasn’t cycled off for many hours, or the fridge runs constantly but isn’t cold, it needs a professional check before it damages the compressor.

If you’re in Quakers Hill or nearby Sydney suburbs, call Ace Fridge Repairs on 0452 462 556 for a diagnosis.

Is It Normal for a Fridge to Run All the Time?

A fridge is built to cycle, not to run non-stop. The compressor switches on to pull heat out of the cabinet. Once the thermostat senses the target temperature (around 3–4°C in the fridge and −18°C in the freezer), it switches the compressor off. Later, as heat creeps back in, it switches on again. This is the cooling cycle, or compressor cycling.

In a healthy fridge, the compressor typically runs for a portion of each hour rather than continuously. Modern fridges, especially inverter models, may run quietly and almost constantly at a very low speed. This can look like “running all the time” but is completely normal.

Normal reasons your fridge runs more than usual:

• Hot weather. Sydney summers make the fridge work harder, especially if the kitchen has no air conditioning.
• A new fridge. New units often run for several hours (sometimes up to a day) when first switched on as they reach temperature.
• Recently loaded groceries. Warm food raises the internal temperature and extends run time.
• Frequent door opening. Busy households, kids and entertaining all let warm air in.
• Defrost cycles. During defrost, the fridge may run harder afterwards to recover temperature.
• Recently unplugged or moved. Give it several hours to stabilise.

If none of these apply and your fridge is never stopping, or takes too long to cycle off, something is wrong.

Signs Your Fridge Is Running Too Much

Watch for these warning signs:

• The motor hums constantly, day and night
• The back or sides of the fridge feel very hot
• Your power bill has risen without explanation
• The fridge is running constantly but food is warm
• Ice buildup in the freezer or a frosted back wall
• Water pooling inside or under the fridge
• Clicking, buzzing, rattling or loud fan noises
• The compressor starts, runs and shuts off quickly, then restarts (short cycling)

Read Also: Fridge Repair vs Replace: The Honest Cost Guide for Sydney Households

Top Causes of a Fridge Running Constantly

1. Dirty Condenser Coils

The most common cause. The condenser coils release heat from the refrigeration system. When they’re coated in dust, pet hair and kitchen grease, heat can’t escape. The compressor works longer to make up for it, and can overheat.

Signs:

• Fridge runs constantly and the back or bottom is hot
• Fridge is cooling, but the compressor won’t stop
• Higher energy bills

What you can do: Unplug the fridge, locate the coils (at the back or under the fridge behind the kickplate) and gently vacuum them with a soft brush attachment. Aim to do this at least once or twice a year, more often with pets.

2. Faulty Condenser Fan Motor

The condenser fan pulls air across the condenser coils and the compressor. If the fan motor fails, heat builds up and the compressor runs longer and hotter.

Signs:

• No fan noise from the bottom or back of the fridge
• A hot compressor area
• The fan blades don’t spin freely, or the fan makes grinding noises

Fix: The condenser fan motor usually needs replacement by a technician.

3. Faulty Evaporator Fan Motor

The evaporator fan circulates cold air from the evaporator coils (inside the freezer) throughout the fridge. If it fails, the freezer may stay cold while the fridge compartment warms up. The compressor keeps running because the thermostat never registers the correct temperature.

Signs:

• Freezer is cold but the fridge is warm
• Fridge running constantly but not cooling properly
• Weak or no airflow from the vents
• Squealing or rattling from the freezer

4. Iced-Up Evaporator Coils and a Failing Defrost System

Frost naturally builds on the evaporator coils. The defrost system melts it periodically using a defrost heater, controlled by a defrost timer or control board and monitored by a defrost thermostat (or sensor). If any component fails, ice builds up, blocks airflow, and the fridge can’t cool properly. The compressor then runs continuously trying to compensate.

Signs:

• Thick frost or ice on the back wall of the freezer
• Warm fridge with a cold, frosty freezer
• Water leaking or pooling from blocked drains

Fix: Diagnosis of the defrost heater, defrost thermostat and control board is best left to a technician. A temporary manual defrost (switch off, empty, leave doors open for several hours) may restore cooling for a while, but the fault will return.

5. Worn or Damaged Door Seals (Door Gasket)

If the door seal doesn’t close tightly, warm air leaks in constantly. The fridge fights this by running non-stop.

Signs:

• Visible cracks, tears, mould or hardening on the rubber
• Condensation around the door edges
• Frost near the seal
• Door doesn’t close by itself or feels loose

Simple test: Close a strip of paper in the door. If it slides out easily, the seal isn’t gripping. Test in several spots around the door.

Fix: Clean the gasket with warm soapy water first. If it’s still not sealing, the door gasket needs replacing.

6. Faulty Thermostat or Temperature Sensor

The thermostat or temperature sensor tells the compressor when to start and stop. If it’s faulty, it may signal that the fridge is always too warm, so the compressor never gets the message to switch off. The result is often an over-cold fridge or freezer with freezing food, or a fridge that runs endlessly.

Signs:

• Lettuce or drinks freezing in the fridge
• Temperature swings that don’t match the dial setting
• Fridge won’t shut off even at moderate settings

7. Faulty Control Board (Temperature Control Board)

On modern fridges, an electronic control board manages the compressor, fans, defrost cycle and sensors. A fault can cause erratic behaviour, including a compressor that never stops, or one that starts and stops unpredictably.

Signs:

• Random or inconsistent cooling
• Fans and compressor not behaving in sync
• Error codes or flashing lights (model-dependent)
• Problems that come and go

8. Refrigerant Leak or Low Refrigerant

Refrigerant is the substance that carries heat out of your fridge. If there’s a leak, the system can’t move heat efficiently. The compressor runs continuously but the fridge never gets properly cold.

Signs:

• Fridge running continuously and not cold
• Compressor running but no cooling at all
• Warm interior even though everything sounds normal
• Oily residue near pipe joints (sometimes)

Important: Handling refrigerant requires a licensed technician. It’s not a DIY repair, and in Australia refrigerant work legally requires the appropriate licence.

9. Failing or Overheating Compressor

The compressor is the heart of your fridge. If it’s worn out, it may lose efficiency and struggle to hold temperature. It runs hot and long, sometimes tripping its overload protector and restarting repeatedly.

Signs:

• Compressor casing very hot
• Loud humming, buzzing or clicking
• Fridge is running constantly and warm
• Repeated start-stop with little cooling

Compressor replacement is a major repair. A technician can tell you if it’s worth doing based on the age and value of your appliance.

10. Poor Airflow, Overloading or Bad Placement

Sometimes the cause is simple:

• Fridge pushed tightly against the wall or cabinetry with no clearance
• Fridge next to an oven, dishwasher or in direct sun
• Overpacked shelves blocking vents
• Food blocking the air vents between fridge and freezer
• Temperature set too cold

Fridge Running Constantly but Not Cooling: What Does It Mean?

This is one of the most common calls we get. Here’s a quick guide:

Symptom	Most Likely Cause
Runs constantly, back is very hot	Dirty condenser coils or condenser fan failure
Runs constantly, freezer cold but fridge warm	Evaporator fan failure or iced-up coils
Runs constantly, frost on back wall of freezer	Defrost system fault
Runs constantly, nothing gets cold, no frost	Possible refrigerant leak or compressor failure
Runs constantly, condensation around door	Worn door seal
Runs constantly, food freezing	Thermostat or temperature sensor fault
Random behaviour, error lights	Control board fault

Why Is My Fridge Running Constantly at Night?

Many people notice the hum more at night simply because the house is quiet. But if the fridge is truly running constantly at night, consider:

• Warm evenings. Sydney’s summer nights keep the kitchen warm.
• Late-night grocery loads or leftovers put in warm.
• Dirty coils struggling in warm conditions.
• Door not sealing after a late-night snack, so check it’s fully closed.
• Failing fan or compressor that only becomes noticeable when things are quiet.

If it’s not stopping through the night and the fridge feels warm in the morning, book a service.

Step-by-Step Checklist: What to Check Before Calling a Technician

Work through these safe checks first:

1. Check the door. Make sure both fridge and freezer doors are fully closed and nothing is blocking them.
2. Check the temperature settings. Fridge: about 3–4°C. Freezer: about −18°C. Extremely cold settings make the compressor run longer.
3. Give it time. If you’ve just loaded groceries or the weather is very hot, allow several hours.
4. Test the door seals. Use the paper test and inspect for cracks or gaps.
5. Clean the door gaskets with warm soapy water.
6. Check clearance. Leave a few centimetres of gap at the back and sides so air can circulate.
7. Don’t overpack. Keep vents inside clear so cold air can flow.
8. Clean the condenser coils. Switch off and unplug the fridge first. Vacuum gently.
9. Listen for the fans. Silent fans, grinding or rattling sounds point to a motor problem.
10. Look for ice. Heavy frost in the freezer suggests a defrost problem.
11. Feel the sides and back. Warm is normal. Very hot is not.

If the problem continues after these checks, the fault is likely mechanical or electrical.

What Not to Do

• Don’t keep turning the temperature dial lower. It makes the compressor work harder and can freeze food.
• Don’t chip ice with sharp tools. You can puncture the evaporator and cause a costly refrigerant leak.
• Don’t try to top up refrigerant yourself. It’s illegal without the right licence and can be dangerous.
• Don’t ignore it. A constantly running compressor overheats and wears out faster, and can lead to a much bigger repair bill or full failure.
• Don’t open electrical panels or touch wiring while the unit is plugged in.

Read Also: Fridge Not Cooling But Freezer Works? Here Is What Is Usually Going On

When to Call a Professional Fridge Repairer

Book a technician if:

• The fridge has been running constantly for more than a day
• It’s running constantly and not cold
• The compressor is very hot or making unusual noises
• You suspect a refrigerant leak
• Ice keeps returning after defrosting
• Food is spoiling or freezing unexpectedly
• Your electricity bill has jumped

Ace Fridge Repairs can diagnose the exact cause quickly, whether it’s a fan motor, defrost component, thermostat, control board or compressor issue, and give you a clear repair recommendation.

What Happens During a Fridge Repair Visit?

A good technician will:

1. Ask about symptoms and how long the problem has been happening
2. Check temperatures inside the fridge and freezer
3. Inspect door seals and airflow
4. Test the condenser and evaporator fans
5. Inspect coils for dirt or ice
6. Test the defrost system: heater, thermostat and control components
7. Test the thermostat, temperature sensors and control board
8. Check compressor performance and electrical draw
9. Check for signs of refrigerant leaks
10. Explain the fault and options before starting the repair

Repair or Replace? How to Decide

Repairing usually makes sense when:

• The fridge is under about 8–10 years old
• The fault is a fan motor, thermostat, sensor, door seal, defrost part or control board
• The unit is otherwise in good condition
• It’s a high-quality or built-in model that’s costly to replace

Replacing may be better when:

• The compressor has failed on an older fridge
• There’s a major sealed-system leak
• Repair costs approach the price of a comparable new fridge
• The unit is very old and inefficient

A technician can give you an honest opinion based on the specific model.

How to Prevent Your Fridge From Running Constantly

• Clean the condenser coils every 6–12 months
• Check and clean door seals regularly
• Keep 2–5 cm of clearance around the fridge
• Avoid placing it near ovens or in direct sun
• Let hot food cool before storing it
• Don’t overfill and keep vents clear
• Keep the temperature at recommended settings
• Defrost manual-defrost freezers before ice becomes thick
• Book a service if you notice unusual noises or temperature changes

Fridge Repairs in Quakers Hill and Surrounding Areas

Ace Fridge Repairs is a local fridge repair service based in Quakers Hill, helping households and businesses across the local area with fridge and refrigerator problems, including constant running, poor cooling, noisy compressors, ice buildup and leaking.

Ace Fridge Repairs
93B Pagoda Crescent, Quakers Hill NSW
Phone: 0452 462 556

Call for a diagnosis if your fridge:

• Runs constantly or never switches off
• Runs constantly and isn’t cold
• Has a compressor that won’t turn off
• Is icing up or leaking
• Is making unusual noises

Frequently Asked Questions

Get Your Fridge Running Properly Again

A fridge that runs all the time is telling you something is wrong. Catching it early can save your food, your power bill and your compressor. Call Ace Fridge Repairs on 0452 462 556 or visit us at 93B Pagoda Crescent, Quakers Hill.