When a walk-in starts drifting, every minute costs money. This is the triage we walk customers through on the phone while we're rolling a truck — most of the time these steps buy enough time to avoid spoilage and, occasionally, they surface a problem you can fix yourself.
First: confirm it is actually failing
Is the box temperature rising, or did someone prop the door open? Walk-in temperature often climbs 10–15°F on busy receiving mornings and recovers within 30 minutes. Watch the thermometer for ten minutes. If it is still climbing, proceed.
Check the obvious
- Door gaskets and sweep. A bad gasket is the single most common cause of slow-drift failures. Run a dollar bill around the seal — if it slides out easily, the gasket is the problem.
- Evaporator iced over? A coil encased in ice can't absorb heat. Shut the unit off, prop the door open, and let it defrost. Call a tech to diagnose the root cause (usually a bad defrost heater, termination sensor, or low charge).
- Condenser airflow. Is the condenser (outside or on the roof) blocked? Cardboard, debris, or a dead compressor fan starves the system. If the fan isn't spinning, that's the call.
- Breaker or disconnect. Check the breaker panel and the disconnect at the unit. Sometimes the simplest cause is a tripped breaker.
Buy time for product
- Close the door and keep it closed. Every opening dumps cold air.
- Move the most perishable product to the freezer or to a backup cooler if you have one.
- Bag ice over highest-value product. A cheap trick that extends safe holding temperatures by hours.
- Turn off interior lights. They generate heat you don't need.
What to tell the tech
When you call, have these three pieces of information ready:
- Brand and model of the unit (usually a sticker inside the box or on the condenser).
- Current box temperature and how fast it is rising.
- What you already checked (iced coil, fan not spinning, gasket torn, etc.).
That three-minute conversation saves an hour of diagnostic time on arrival.
Who to call
Commercial refrigeration is what we triage first every day — new customer or existing. Call (941) 205-6331 for any walk-in, line cooler, or ice-machine emergency in the SW-Florida service area. After-hours dispatch is available when product is at risk.