The Short Answer
If a commercial fridge is running but not cooling, the cause is usually airflow, not the compressor. In order: clean the dust-caked condenser coils, clear boxes blocking interior vents, and check the door gaskets — these staff-level fixes resolve most cases. If it still drifts warm, the condenser fan, defrost system, or sealed system needs a technician. And because product above 4°C for ~2 hours becomes a food-safety loss, treat a warming cooler as a priority.
The Countdown Clock
A residential fridge losing cool is an inconvenience; a commercial one is a business event. Cold-holding equipment has to keep product at or below 4°C, and once it climbs past that for about two hours you are into the food-safety danger zone — which can mean discarding inventory and, if an inspector is present, a compliance problem. So the first thing to do is not panic-diagnose, but move perishable stock to a working cooler while you run the checklist below.
The Six-Point Checklist
| Check | What You’re Looking For | Who |
|---|---|---|
| Condenser coils | A blanket of dust, flour, or grease on the coils — the #1 commercial cooling killer | Staff |
| Airflow & loading | Boxes blocking interior vents, or the unit packed after a delivery | Staff |
| Door gaskets | Torn or hardened seals; a dollar bill slides out too easily when shut | Staff |
| Condenser fan | Fan not spinning when the compressor runs — warm air not being expelled | Technician |
| Evaporator / defrost | A sheet of ice on the interior coil choking airflow | Technician |
| Compressor / sealed system | Unit runs constantly, clicks, or is warm everywhere | Technician |
Start With the Coils
If you do only one thing, clean the condenser coils. In a working kitchen they collect a felt of grease, dust, and airborne flour that acts like a blanket, trapping the very heat the fridge is trying to expel. A coil so clogged that the unit cannot shed heat will run constantly and still drift warm — and it is behind a large share of “not cooling” service calls. Kill the power, vacuum and brush the coils clean, clear the airflow around the unit, and give it an hour to recover before judging.
“Nine times out of ten the 'dead' cooler just couldn't breathe — the coils were doing an impression of a lint trap.”
Field note — The Technician Team
When to Call a Technician
Clean coils, clear vents, good gaskets, and it still will not hold temperature? The fault has moved into the mechanical side — a condenser fan that has stopped, an evaporator iced over from a defrost fault, or a sealed-system and compressor problem. Those need refrigeration-trained hands and gauges, not guesswork. Our commercial refrigeration repair team in Sherwood Park prioritizes warm-cooler calls and carries common fan, thermostat, and control parts on the vehicle. For box-scale refrigeration, the walk-in cooler bulletin goes deeper.
Cooling Questions, Answered
Why is my commercial fridge not cooling but still running?
Most often it is airflow, not the compressor. Dust-caked condenser coils, a failed condenser fan, blocked interior vents, or worn door gaskets stop the unit from removing heat even while it runs non-stop. Clean coils and clear vents first; if it still drifts warm, a technician should test the fans, defrost system, and sealed system before you assume a compressor failure.
How quickly does a warm commercial fridge become a food-safety problem?
Fast. Cold-holding equipment must keep food at or below 4°C, and once product sits above that for roughly two hours it enters the danger zone where you may be legally required to discard it. That is why a warming commercial cooler is treated as a priority call — the repair usually costs far less than the inventory and the health-code risk.
Can cleaning the coils really fix a commercial fridge?
Surprisingly often, yes. Condenser coils in a busy kitchen clog with grease, dust, and flour, which traps heat and cripples cooling. A thorough coil cleaning restores performance in a large share of "not cooling" calls — and doing it on a schedule prevents most of them from happening at all.