Quick answer: A reach-in that will not cool is usually choked by dirty condenser coils. Check the coils, the condenser fan, and the door gasket first, and move product under 41°F before it becomes a food-safety problem.
When a reach-in stops holding temperature, the clock starts. The FDA Food Code caps cold food at 41°F, so a warm box means moving product to a working cooler now and finding the cause fast, starting with the coils.
Clean the condenser coils first
Condenser coils dump the heat pulled out of the box, and in a kitchen they cake with grease and dust fast. Dirty coils are the most common reason a reach-in runs warm, and they force the compressor to run longer to hold temperature. Unplug the unit, brush the coils in the direction of the fins, and vacuum the debris. Clean them every one to three months, more often in a heavy, greasy kitchen. See how to clean commercial refrigerator condenser coils for the full method. This one task fixes more cooling complaints than anything else.
Then the fan, the gasket, and the load
If the coils are clean and it still will not cool, work through the airflow:
- A condenser or evaporator fan not running: no airflow means no heat exchange and no cold air moved through the box.
- A door gasket not sealing: close the door on a dollar bill, and if it pulls out easily, warm air is leaking in and the compressor runs nonstop.
- Overloaded shelves: leave a couple of inches around the vents so cold air can circulate.
Check the thermostat
Confirm the dial is set to 36 to 38°F, the range that holds product under the 41°F limit. See what temperature a reach-in refrigerator should be for the setpoint and why it keeps headroom; a walk-in cooler holds to the same 41°F line. Then test the control: put a thermometer in a glass of water in the center of the box and read it after four hours. If it is off from the dial by more than 3°F, the thermostat needs recalibrating or replacing.
When it is a sealed-system problem
If the coils are clean, the fans run, and the gasket seals but the box still will not cool, you are likely looking at a refrigerant leak or a failing compressor. Both need a technician: refrigerant handling requires EPA certification, and a compressor that hums but will not cool is a sealed-system repair, not a floor fix.
Frequently asked questions
Why is my reach-in refrigerator not cooling?
A reach-in that will not cool is usually choked by dirty condenser coils, the single most common cause. Check the coils, the condenser fan, and the door gasket first, and move product under 41°F before it becomes a food-safety problem.
How do you fix a commercial refrigerator that is not cooling?
Start with the condenser coils, since dirty coils are the number one cause: unplug the unit and brush and vacuum them clean. Then check that the condenser and evaporator fans run, the door gasket seals, and the box is not overloaded, and confirm the thermostat is set to 36 to 38°F. A clean, sealed, well-set box that still will not cool points to a refrigerant leak or a failing compressor, which needs a technician.
A reach-in that cannot hold 41°F puts every shelf at risk, and there is no automatic grace period to fall back on. ProToCall runs down why a box stopped cooling, from a caked coil to a failing compressor, and gets it back on temperature. Book commercial refrigeration repair or call 866-297-5082.
The same checks apply to a walk-in; if yours is running too cold instead, see why a walk-in cooler freezes food.