If your reach-in freezer isn’t holding temperature, the most likely cause is one of three things: a failing door gasket, dirty condenser coils, or a refrigerant issue. Here’s how to check the first two yourself before calling anyone, and what a tech will do when you do.
Start with the door gasket
The gasket is the rubber seal around the door. When it wears out, cracks, or gets food debris packed into it, warm air sneaks in continuously. The compressor works harder but can’t keep up, and the box drifts above setpoint.
To check it: close a dollar bill in the door and pull it out. There should be noticeable resistance all the way around the perimeter. If it slides out easily at any point, you have an air leak there. You can also run your hand slowly around the door edge while the unit is running to feel for escaping cold air. Check the hinge corners and the bottom edge first. Those are the most common failure spots.
If the gasket is torn, stiff, or deformed, it needs to be replaced. Getting a new gasket to seat flat and seal consistently around the full perimeter is finicky work. A replacement that doesn’t sit right is worse than the original problem. We handle gasket swaps as part of a service call, and it’s usually a quick fix once a tech is on site.
Condenser coils and airflow
The condenser sheds heat out of the refrigerant loop. In a commercial kitchen, those coils collect grease, dust, and flour fast. When they’re coated, heat can’t escape, the compressor runs hot, and the system loses capacity.
The access panel is usually on the front-bottom of the unit or on top, depending on the model. Pull the panel and look. If the coil looks like a gray mat, it needs cleaning. Most manufacturers call for cleaning at least every three months. In a high-grease kitchen, monthly is more realistic.
Coil cleaning is included in any preventive maintenance visit. If yours are overdue, that’s worth scheduling on its own.
Also check the clearance around the unit. Reach-ins need airflow around the condenser. A unit pushed tight against a wall or sitting in a warm, unventilated corner will struggle to shed heat no matter how clean the coils are. A few inches of clearance makes a real difference.
Refrigerant problems
Low refrigerant is the third common cause, and it’s one you can’t check or fix yourself. Refrigerant doesn’t deplete in a sealed system unless there’s a leak. If a tech finds the system is low on charge, the leak has to be found and repaired before recharging. Adding refrigerant without fixing the leak is a temporary fix, and it won’t last.
Signs that point toward a refrigerant issue rather than the other two: the unit runs constantly but still can’t pull down to setpoint, frost on the evaporator coil is absent or only on part of it rather than evenly distributed, or the large insulated suction line going into the compressor isn’t cold to the touch during operation. Note these before you call. It helps with diagnosis.
Refrigerant work requires EPA Section 608 certification. Don’t attempt it.
What a tech checks
When a tech shows up, they’ll connect a gauge manifold to the service ports and read suction and discharge pressures. That tells them immediately whether the system is operating at the right pressures or is undercharged. They’ll check superheat and subcooling, look at evaporator frost patterns, and use an electronic leak detector if a leak is suspected.
If you can tell them “gasket looks good, coils are clean, unit runs constantly but won’t pull below 15°F,” you’ve saved diagnostic time and get a faster, more accurate quote.
Call us
If the unit still isn’t holding temp after you’ve checked the gasket and coils, call a refrigeration tech. Also call right away if you hear unusual compressor noise, see ice completely blocking the evaporator, or notice the suction line is warm during operation. Those don’t fix themselves and get more expensive the longer they run.
Bay Area Refrigeration Service handles commercial reach-in repairs across the Bay Area. Tell us what you’ve already checked and we’ll get you on the schedule fast, often same or next day when we can.