Aber HVACRWalk-in freezer trouble
Walk-in freezer not freezing? Check these first, then call us.
If the display reads above 0°F and the number keeps climbing, keep the door shut and start with the two-minute checks below. If they don't bring it back, call or text a photo and we come out, nights and weekends too.
(973) 356-8290Paterson, Wayne, Clifton, Totowa, Little Falls, Woodland Park, Haledon, Hawthorne, Fair Lawn and Elmwood Park, and the rest of North Jersey
Two-minute checks you can do safely
The door. Is it shut all the way and latched? Look for a torn or flattened gasket, ice on the frame, or a strip curtain tied back. A door that rests a little open all night can ice up the whole coil.
The setting. Check that nobody bumped the thermostat or controller. If the display shows a defrost, the box warms a few degrees for a short while; check again when it ends.
The breaker. Find the freezer's breaker and the disconnect next to the condensing unit. Reset a tripped breaker once. If it trips again, leave it off and call.
The condenser. Outside, on the roof or on top of the box: is the fan turning, and is the coil clear of dust, grease, leaves, cardboard and snow?
The coil inside. Look up at the evaporator. Are its fans spinning? Is the coil lightly frosted, or packed solid with ice? Is product stacked in front of it?
Don't chip ice off the coil, don't open electrical panels, and don't unplug the system to reset it. A punctured coil turns a repair into a replacement, and a unit left running lets us see the fault when we arrive.
When to stop and call us
- The breaker trips again after one reset
- The evaporator coil is a solid block of ice
- The fans inside the box or at the condensing unit don't turn
- The condensing unit hums or clicks but the compressor won't start
- You hear hissing, or see oily spots on the refrigeration lines
- You smell burning
- Everything above looks fine and the temperature still climbs
Why a walk-in freezer stops freezing
What we find most often
These are the causes a technician works through, roughly from the most common. Several of them often show up together: a bad door gasket ices the coil, and an iced coil makes the compressor run without stopping.
- Ice on the evaporator coilFrost that melts off in each defrost is normal. A coil packed with ice can't move air, so the box warms even though the compressor keeps running.
- A defrost that isn't workingA freezer melts the frost off its coil with heaters, run by a timer or controller and stopped by a termination thermostat. When one of them fails, the ice keeps growing. A failed drain line heater lets the melt water refreeze in the pan, and ice builds up under the coil.
- Door gasket, hinges and frame heaterA torn or flattened gasket, a sagging hinge, a closer that doesn't pull the door shut, or a frame heater that lets the door freeze open. Warm, damp air gets in and shows up as snowy frost on the coil and the ceiling.
- A dirty or blocked condenserGrease, dust, leaves or a failed condenser fan stop the system from shedding heat. It runs hot and long, falls behind, and can shut itself off on high pressure, more often on hot days.
- Low refrigerant from a leakLong run times, frost on only part of the coil, oily spots at a joint. The leak has to be found and repaired; adding refrigerant alone only buys time. This is EPA 608 certified work.
- Fan motorsWhen the evaporator fans stop, the coil ices and the box warms unevenly. When the condenser fan stops, the compressor overheats, shuts off, cools down and starts again, so the unit can look fine for a while.
- The compressor and its electrical partsA burned contactor, a failed capacitor or start relay, or an overload that keeps tripping. You hear humming, clicking or short cycling, or nothing at all.
- Controls and sensorsA failed sensor or controller can read the wrong temperature, or hold the box in defrost.
- An overloaded boxA delivery of warm product loaded all at once, cases stacked against the coil, the door propped open while unloading. A walk-in freezer keeps frozen product frozen; it is slow at freezing large warm loads.
Protect your product while you wait
- Keep the door shut. Every opening lets warm, damp air in. Plan one trip for what the kitchen needs.
- Write down the time and the temperature now, and again every hour.
- Move the most valuable product to a freezer or reach-in that is holding temperature.
- Keep the rest packed together; a full, closed box holds its cold longer than a half-empty one.
- Product that still has ice crystals in it has not thawed. Anything that has warmed past 41°F is a food-safety decision: follow your food safety plan, or ask your local health department, before deciding what stays.
The numbers to holdCoolers: 41°F (5°C) or below, the FDA Food Code's cold-holding limit. Freezers: 0°F (-18°C) or below, where the USDA puts safe frozen storage.
What we do when we get there
We look before we touch. The door, the coil, the drain, the fans and the condensing unit, with the system still running, so the fault shows itself.
We measure. Temperatures, pressures and electrical readings, and we tell you what we found and what it needs before any work starts.
We fix it and watch it pull down. Then we tell you what would stop it happening again, whether that is a gasket, a clean condenser or a maintenance plan.
Questions
Why is my walk-in freezer running but not freezing?
When the compressor runs and the box stays warm, the usual suspects are an iced coil, a dirty condenser, a failed evaporator fan, or low refrigerant from a leak. Start with the checks above; if the coil is iced solid or the condenser fan isn't turning, call.
Why is there snow on the ceiling and the coil?
Snowy frost is moisture from warm air getting into the box, most often around a door that doesn't seal or close by itself. A gasket, a hinge or a closer usually fixes it, and a strip curtain helps during deliveries.
How long will my product hold if the freezer stops?
It depends on how full the box is, how often the door opens and how warm the room around it is. Watch the thermometer, not the clock, and keep the door shut.
Is a walk-in freezer above 0°F an emergency?
If the reading keeps climbing, yes. We take emergency calls nights and weekends.
Can I defrost the coil myself?
Don't chip or pry the ice. If the coil is a solid block, tell us when you call; a manual defrost is often the first step, and the reason it iced still has to be found, or it comes back.
Where do you work?
We are based in Paterson and cover Wayne, Clifton, Totowa, Little Falls, Woodland Park, Haledon, Hawthorne, Fair Lawn and Elmwood Park, and the rest of North Jersey. Commercial projects anywhere in New Jersey.