What to Tell a Refrigeration Technician Before They Arrive

Five minutes of notes before you call can save an hour of diagnosis, and a second trip for the wrong part. Good information also helps you understand the diagnosis and judge the quote.

Before you call: the 5-minute checklist

1. Cooler or freezer? And roughly what size.
2. Temperatures now. The box air temperature on the display and on your own thermometer, plus a few product temperatures.
3. When it started. When was the box last known to be at normal temperature? Did it fail suddenly or drift warmer over days?
4. What is running. Are the evaporator fans inside turning? Is the condensing unit (the outdoor or remote unit with the compressor) running, humming or silent?
5. What the controller shows. Any code, flashing light or alarm. Photograph it before anyone presses a button.
6. What you have already checked. Breakers, disconnect switches, setpoint, and whether anything was blocking the condenser. Say which breaker tripped and whether it tripped again after a reset.
7. Urgency. How much product is at risk, and whether you can move it.

If you haven't done the basic checks yet, the first-hour plan in walk-in cooler stopped working lists them.

Nameplate details to gather

The technician needs to know what equipment they are walking into so they can bring the right parts and refrigerant.

Get the brand right. Heatcraft (a Lennox company, with brands such as Bohn, Larkin and Climate Control) and Russell (an HTPG brand in the Rheem family) are separate manufacturers with different controllers and manuals. If you don't know the controller brand, a photo of the display is enough. The controller alarm codes guide shows how codes differ by brand.

Describe the problem clearly

Describe what you see, hear and smell rather than guessing at the cause. Useful details include:

• Sounds: clicking without starting, humming, grinding, squealing, rattling, a hiss.
• Ice and water: ice on the evaporator coil, frost on piping, water on the floor or dripping from the unit.
• Pattern: fails every afternoon, only after deliveries, only in hot weather, or constantly.
• Recent events: a power outage or storm, a heat wave, a large delivery of warm product, cleaning or pressure washing near the units, a door that was left open, recent construction, or a recent service visit.
• History: previous repairs, and whether refrigerant has been added before. Repeated refrigerant additions point to a leak; see refrigerant leaks and recharging.

A short example you can adapt: "Our walk-in cooler at [address] is at [temperature] and rising. It was normal at [time]. The fans inside are running but the outdoor unit is silent. The controller shows [code]. The breaker hasn't tripped. The condensing unit is a [brand, model] on [refrigerant]."

Photos to take

• Both nameplates, close enough to read.
• The controller display, including any code.
• The evaporator coil, especially if it has ice on it.
• The condensing unit and the area around it.
• Any water, oily stains at fittings or visible damage.
• Your temperature log.

Send them ahead if the service company accepts photos. It helps them bring the right parts.

Give the technician access

• Roof or remote units: have the roof hatch, ladder and any keys ready, and tell them if access is difficult.
• Electrical panel: know where the walk-in breakers are and leave the panel accessible.
• Clear the box: move product away from the evaporator and the door area so the technician can work.
• Decision-maker: have someone on site or on the phone who can approve a repair, especially after hours.

Safety: Staff shouldn't go onto a roof or into mechanical spaces to "help" unless that is part of their normal duties and the access is safe. Leave panels closed for the technician.

Questions to ask about the diagnosis

1. What failed, and why? A failed part is often a symptom. Ask what caused it, for example a dirty condenser, low voltage or a leak.
2. Did you add refrigerant? How much, and did you find the leak? Adding refrigerant without finding the leak means it will be back. For systems with a full charge of 15 lb or more of HFC refrigerant, EPA's leak repair rule requires the leak rate to be calculated at each addition and, for commercial refrigeration over 20%, repaired within 30 days.
3. Are you EPA Section 608 certified? It is legally required to open the refrigerant system. See hiring a refrigeration technician for other credentials worth asking about.
4. Is this a permanent repair or a temporary one? Get it in writing if it is temporary.
5. Is the part under warranty? Heatcraft unit cooler and condensing unit warranties run 1 year from installation or 18 months from shipment, whichever comes first. Heatcraft and KPS warranties exclude neglect or lack of maintenance, so keep your service records. See walk-in cooler warranty claims.

Questions to ask about the quote

1. Can I have it in writing, with parts, labor, refrigerant and any after-hours charge listed separately?
2. What would each option cost? For example, repairing the part versus replacing a larger assembly.
3. How old is the system, and is it worth repairing? DOE's analysis puts the average walk-in refrigeration system lifetime at about 8.5 years. An older system facing a major repair deserves a repair-or-replace conversation.
4. If replacement is suggested, what refrigerant would the new equipment use? Since 27 July 2026, new remote condensing units for retail food may not use refrigerant with a global warming potential of 1,400 or higher, which rules out R-404A in a new remote condensing unit. Existing R-404A systems can still be serviced and repaired.
5. Does a larger replacement unit count as a new installation? Under EPA rules, increasing a walk-in system's cooling capacity by any amount can count as a new installation, which brings in the new-equipment refrigerant limits.

Repair prices vary by region, refrigerant, access and time of day. The walk-in cooler repair cost guide covers typical ranges, and the repair or replace guide helps with the bigger decision. When replacement is the answer, JayComp designs and installs new condensing units and complete walk-in systems; see Heatcraft walk-in condensing units.

After the visit

Ask for a written service report that lists what was found, parts replaced, and any refrigerant added or removed. For systems covered by EPA's leak repair rule, owners must keep records, including the full charge, for at least 3 years. Those records also support warranty claims, and they give the next technician a head start.