Quick Answer
A fridge that runs constantly without the compressor cycling off is usually caused by one of six faults: a dirty condenser coil, a worn door seal letting warm air in, a faulty thermostat, a failing evaporator or condenser fan, a fridge overloaded or set too cold, or a refrigerant issue in the sealed system.
A fridge that's constantly running isn't always broken yet — but it is using significantly more electricity, and it's usually the first sign of a fault that gets more expensive the longer it's left.
Every fridge cycles its compressor on and off — that's completely normal. What isn't normal is a fridge that runs continuously, all day and all night, without ever pausing. It's one of the most common calls DP Electric receives, because it's easy to notice on a power bill before it's obvious the fridge is actually struggling.
Here are the six causes technicians see most often in Melbourne homes, starting with the two you can check yourself in under five minutes.
Start Here: The Condenser Coil and Door Seal
These two account for a large share of non-stop-running fridges, and both are safe for a homeowner to check. The condenser coil (usually at the back or underneath the fridge) radiates heat out of the system — when it's coated in dust and pet hair, the fridge has to run far longer to dump the same amount of heat. The door seal (gasket) keeps cold air in; once it cracks, sags or loses its magnetic grip, warm room air constantly leaks in and the compressor never gets to rest.
- Vacuum the condenser coil (back or underneath the fridge) — a build-up of dust noticeably reduces cooling efficiency
- Check the door seal by closing the door on a piece of paper and pulling it out — it should resist, not slide out freely
- Look for visible cracks, sagging or mould along the door gasket
- Confirm the fridge isn't pushed hard against a wall, blocking airflow around the coil
The Other Four Causes
- Faulty thermostat — stuck 'on' and never signals the compressor to stop, even once the target temperature is reached
- Failing evaporator or condenser fan motor — struggles to move air efficiently, so the compressor compensates by running longer
- Fridge overloaded or packed too tightly — blocks internal airflow, so cold air can't circulate evenly and the compressor keeps working
- Low refrigerant or a sealed-system fault — the compressor runs constantly trying to reach a temperature it physically can't, without ever being able to
How to Tell Which One It Is
A coil or seal problem usually comes on gradually over weeks or months as dust builds up or a seal slowly degrades. A thermostat or fan fault tends to be more sudden — the fridge was cycling normally, then one day it wasn't. A refrigerant fault is the least common but the most serious: alongside constant running, you'll usually also notice the fridge isn't actually getting cold enough despite running non-stop, which is different from a coil/seal issue where the fridge does eventually reach temperature, just inefficiently. If your fridge fits that second pattern, see our guide on a fridge not cooling properly for the next steps.
Why It's Worth Fixing Even If the Fridge Still 'Works'
A fridge that runs 90% of the time instead of a normal 30–50% duty cycle can add a meaningful amount to a power bill over a full quarter, and it puts continuous wear on a compressor that's designed to rest. Left long enough, several of these faults — especially a failing fan motor or a refrigerant leak — end in a full compressor failure, which is a far more expensive repair than the original fault would have been. Our fridge repair technicians can diagnose which of the six causes applies in a single visit.
What's Safe to Check Yourself vs When to Call a Pro
Safe to Check Yourself
- Vacuum or brush dust off the condenser coil
- Test the door seal with the paper-strip check
- Confirm the fridge has clear airflow space around the back and sides
- Check the fridge isn't overloaded or set colder than needed (3–5°C is standard for the fridge compartment)
- Note whether the fridge eventually reaches a cold temperature (points to coil/seal/airflow) or never quite gets there (points to thermostat, fan or refrigerant)
Always Call a Licensed Technician
- Testing and replacing a faulty thermostat
- Diagnosing and replacing a failing evaporator or condenser fan motor
- Diagnosing a refrigerant or sealed-system fault
- Replacing a worn door seal/gasket with the correct part for your model
Frequently Asked Questions
Is it normal for a fridge to run all the time on a hot day?▼
Fridges do run more often during hot weather or right after being restocked with groceries — that's normal. The concern is a fridge that runs continuously for days at a time regardless of the weather or how full it is.
How much does a fridge running constantly add to my power bill?▼
It varies by fridge size and fault, but a compressor running 80–90% of the time instead of a normal 30–50% duty cycle can noticeably increase running costs over a billing quarter — often more than the cost of a repair.
Can I clean the condenser coil myself safely?▼
Yes — unplug the fridge first, then vacuum or brush the coil gently. This is one of the safest and most effective DIY checks for a non-stop-running fridge.
How much does it cost to fix a fridge that won't stop running?▼
Simple fixes like a door seal replacement typically fall in the $150–$300 range. Thermostat, fan motor or refrigerant faults vary more depending on the part and model — we provide a fixed, upfront quote before any work begins.
Should I unplug the fridge while waiting for a repair?▼
Generally no — unplugging risks food spoilage and won't fix the underlying fault. If the fridge is running hot to the touch, making unusual noises, or you smell burning, that's the exception — turn it off and call a technician.
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Dishank Patel
Lead Technician & Founder · DP Electric Melbourne
Dishank Patel has over 10 years of hands-on experience repairing household appliances across Melbourne's eastern suburbs. He holds all required Victorian electrical and gas licensing and has personally repaired thousands of appliances across brands including Bosch, Miele, LG, Samsung, and Fisher & Paykel.