If your walk-in cooler is warming up right now, call (208) 596-7757 first — we run commercial refrigeration service across the Palouse and we'll dispatch a tech. Then work this checklist while you wait. The next 60 minutes decide whether you lose product or save it.
What actually happens when a walk-in fails?
Commercial walk-in coolers hold product at around 34–38°F. Once the evaporator or condensing unit stops moving heat, the box starts drifting up. In a well-sealed cooler, you have roughly 4–8 hours before critical product hits unsafe temps — less if the door has been opened, less if it's a hot day and the box is exposed to a warm kitchen.
The failure could be as small as an iced-over evaporator coil (fixed in an hour) or as serious as a compressor lockout (multi-day). You don't know which until a tech gets eyes on it. What matters right now is triage: protect product, document what you see, and get the right person moving.
What should you do in the first hour?
- Stop opening the door. Every open cycle dumps cold air and pulls warm humid air in, which then freezes onto the evaporator coil and makes any coil-icing problem worse.
- Check the compressor. Is the condensing unit outside or on the roof running? Any smell, any loud clicks, any visible ice on the suction line? Note it — the tech will ask.
- Check the evaporator. Inside the box, are the fans running? Is the coil iced over solid? A coil that looks like a snowball is a defrost or airflow problem, not a refrigerant problem — different repair.
- Move product if temp climbs above 41°F and you have a backup cooler or freezer with capacity. If not, prioritize dairy, seafood, and meat — those are the highest food-safety and dollar-value items.
- Photograph the thermometer every 30 minutes. If insurance is involved later, you want a timeline.
Where do restaurant owners go wrong?
The most expensive mistake is calling a residential HVAC contractor. Walk-ins run on different refrigerants, different controls, and different EPA and food-code requirements than a residential AC. Most local residential contractors will decline the call — and the ones who take it often can't get parts or make a repair that holds. Ask directly whether the contractor services commercial refrigeration; if they hesitate, keep dialing.
The second mistake is skipping preventive maintenance. Walk-ins that get quarterly service — coil cleaning, defrost timer check, condenser blow-out, refrigerant charge verification, door seal inspection — almost never have catastrophic surprise failures. The ones that fail out of nowhere are almost always the ones that haven't been touched in two years.
What we've seen on the Palouse
Commercial refrigeration is a core differentiator for Unlimited. Very few contractors on the Palouse do this work — walk-in coolers and freezers, ice machines, prep tables, remote condensers, restaurant and grocery refrigeration. We've serviced restaurants, convenience stores, and medical facilities across Moscow, Pullman, and Lewiston for 24 years. Our techs are licensed in both Idaho and Washington, which matters when your business spans the state line. When we tell a restaurant owner "we can be there," it's because we actually can — with parts on the truck and the training to make the repair hold.
What to do next
Right now, if you're reading this because a walk-in is warming up: call (208) 596-7757. We'll dispatch a commercial refrigeration tech to your location — Moscow, Pullman, Lewiston, Clarkston, Colfax, or anywhere on the wider Palouse. Once you're back up, ask about a commercial preventive-maintenance plan — quarterly service dramatically reduces the odds you're ever making this call again.