How to Inspect Used Commercial Kitchen Equipment Before You Buy

· 9 min read · KitchenEquipmentTrader Editorial
inspect used commercial kitchen equipment used restaurant equipment buying used kitchen equipment commercial equipment inspection CFESA technician pre-purchase inspection

Most people buying used commercial kitchen equipment make the same mistake: they look at it from five feet away, hear it run for thirty seconds, and make a decision. That's not an inspection — that's a guess. Guesses on a $3,000 refrigerator or a $4,000 dishwasher are expensive when they're wrong.

A proper inspection takes 20-45 minutes per major piece of equipment. It's methodical, it's physical — you'll be getting on your knees, using a flashlight, and testing every function you can access. Done right, it either confirms you're buying something solid or surfaces the problems before they become your problems.

This guide covers the five most commonly purchased used equipment categories: refrigeration, ranges and ovens, fryers, dishwashers, and mixers. For each, you'll get the visual checklist, the operational test, and the specific red flags that mean walk away.

Before You Arrive: What to Bring

Pack this before you go:

  • Flashlight (bright, not your phone)
  • Infrared thermometer (under $30 at any hardware store — invaluable)
  • Notepad and pen
  • Phone camera for documentation
  • The seller's listed model number — look it up in advance so you know what you're evaluating

Ask the seller ahead of time to have the equipment plugged in, powered on, and at operating temperature before your arrival. Refrigeration units especially need to be running to evaluate properly, not just switched on as you walk in the door.

Inspecting Refrigeration

Walk-in coolers, reach-in refrigerators, and undercounter units all share the same inspection logic.

Visual Inspection

  • Door gaskets: Run your finger along the full perimeter of every door gasket. Gaskets should be soft, supple, and fully seated in their channel. Cracks, tears, or sections that have pulled away from the door frame mean the unit is running inefficiently — and replacement gaskets, while available, are a negotiating point.
  • Condenser coil: Located at the back or bottom of reach-in units, in the machine room for walk-ins. Should look like a clean radiator. Heavy dust/grease accumulation is a maintenance red flag. Fins should be straight, not bent or crushed.
  • Evaporator coil: Inside the cabinet. Should be frost-free when the unit is at operating temperature. Heavy ice buildup signals a defrost system failure or refrigerant issue.
  • Compressor: Look for oil staining around the compressor body and refrigerant line connections. Oil staining almost always indicates a refrigerant leak — this is a major red flag. Refrigerant leaks require professional repair and recharge, and in older equipment, the refrigerant type (R-22 is being phased out and is expensive) matters.
  • Cabinet interior: Look for rust, particularly on the floor of the cabinet and around drain openings. Light surface rust on older stainless is manageable; structural rust through the floor panel or on drain tubes is a problem.
  • Shelving: Check that shelves are present, not bent, and that shelf clips or tracks are intact.

Operational Test

  • With an infrared thermometer, measure the actual temperature inside the cabinet. A properly functioning refrigerator should hold 35-38°F. A freezer should hold 0°F or below.
  • Listen to the compressor cycle. It should run smoothly without unusual rattling, grinding, or high-pitched squealing. Some short cycling (compressor turning on and off rapidly) indicates low refrigerant or a control issue.
  • Open and close every door. They should seal firmly without requiring force, and the gasket should create suction resistance when you pull the door open.

Red Flags

  • Oil staining around compressor or line fittings
  • Inability to reach proper temperature despite extended run time
  • Unusual compressor noise — grinding or squealing is a compressor near failure
  • Heavy ice buildup on evaporator coil
  • Rust on the interior floor or structural panels

Pro Tip: Ask the seller when the condenser was last cleaned and whether the unit has been serviced recently. A seller who can answer specifically is likely telling the truth. A seller who shrugs has been running it without maintenance — budget accordingly.

Inspecting Ranges and Ovens

Commercial ranges are generally durable and repairable, but a poorly maintained range can have significant issues that aren't visible at a glance.

Visual Inspection

  • Burner grates: Should be cast iron, solid, and not cracked. Cracked grates may be unavailable as replacement parts on older units — verify parts availability before purchase.
  • Burner caps and orifices: Look for carbon buildup. Heavy buildup indicates the burners haven't been cleaned. Easily remedied, but a sign of general maintenance neglect.
  • Oven interior: Check the oven floor for warping or cracking. Check door hinges — they should support the door firmly without sagging or dropping.
  • Door gasket (oven): Inspect for tears or missing sections. Oven door gaskets affect temperature retention and cook consistency.
  • Knobs and controls: All present? Labels readable? On older units with proprietary knobs, missing control knobs can be surprisingly hard to source.
  • Pilot lights or electronic ignition: Visible, not blocked by grease buildup.

Operational Test

  • Light every burner. The flame should be blue — a clean, stable cone-shaped flame. Yellow or orange flame indicates incomplete combustion from carbon buildup, misaligned orifice, or low gas pressure. This can often be cleaned, but persistent yellow flame after cleaning indicates an orifice problem.
  • Test every burner at low, medium, and high. Flame should adjust smoothly and hold consistently at each setting.
  • Run the oven to target temperature (say, 350°F) and use your infrared thermometer to verify accuracy. Commercial ovens should be within 15-20°F of set temperature when properly calibrated. Significant variance indicates thermostat issues.
  • Test the oven door seal by placing your hand near the door perimeter when the oven is at temperature. You should feel minimal heat escaping. Significant heat loss means a failing door gasket.

Red Flags

  • Yellow or orange flame that doesn't improve after burner cleaning
  • Oven temperature variance of more than 25°F from setpoint
  • Sagging oven door or missing door hinge components
  • Cracked oven floor (can affect heat distribution significantly)
  • Burner orifices that are corroded beyond cleaning

Inspecting Fryers

Fryers are high-stress equipment. Oil at 350°F, thermal cycling hundreds of times a year, grease infiltrating every joint. Inspect carefully.

Visual Inspection

  • Fry pot: The stainless steel vessel itself. Look for structural rust or pitting on the inside. Surface discoloration from high heat is normal; actual rust pitting on the fry pot is a health concern and a structural problem.
  • Oil drain valve: Located at the bottom front of the fry pot. Open and close it. It should operate smoothly and seal completely. A sticky, leaking, or visibly corroded drain valve is a fire risk — hot oil leaks are not minor issues.
  • Heating elements (electric fryers): Check for visible corrosion or scaling on the elements. Severe scaling reduces efficiency and can cause element failure.
  • Burners (gas fryers): Check for carbon buildup on burner tubes. Should be cleanable, but heavy buildup indicates poor maintenance.
  • Baskets: Should be present and structurally intact. Broken basket handles are a burn risk. Easy and inexpensive to replace, but document what you're getting.
  • Frame and exterior: Check for grease saturation on the frame, particularly around the drain valve area. This can indicate past drain valve leaks.

Operational Test

  • Fill with water (or ask the seller to have oil in it) and bring to operating temperature. Use your infrared thermometer to verify thermostat accuracy — set to 350°F and measure actual oil/water temperature.
  • Test the high-limit safety switch if accessible — this is the safety cutoff that prevents oil fires. A malfunctioning high-limit switch is a serious safety issue.
  • Exercise the drain valve fully open and closed during your inspection.

Red Flags

  • Structural rust or pitting inside the fry pot
  • Drain valve that leaks, sticks, or won't seal fully
  • Thermostat that reads more than 25°F off actual temperature
  • Burner tubes with cracks or visible damage
  • Cracked or missing high-limit safety switch

Pro Tip: On older gas fryers, ask the seller whether the unit has a standing pilot or electronic ignition. Standing pilots that haven't been cleaned in years can have thermocouple issues that don't manifest until you've owned the unit for 30 days.

Inspecting Commercial Dishwashers

A dishwasher that doesn't sanitize properly isn't just broken — it's a health code violation waiting to happen. Test thoroughly.

Visual Inspection

  • Spray arms: Remove and inspect upper and lower spray arms. Holes should be open and clear of mineral deposits or debris. Clogged spray arms mean poor wash performance and can indicate hard water damage throughout the unit.
  • Door gasket: Full perimeter inspection. Should seal firmly. Damaged gaskets cause leaks and heat loss.
  • Wash tank interior: Check for scale buildup (white mineral deposits), rust, or debris accumulation in the sump.
  • Heating element: Visible in the wash tank on most units. Check for scaling and physical damage.
  • Control panel: All buttons/switches functional? On older units, control board failures can be expensive and parts may be obsolete.
  • Chemical dispensing lines (on chemical sanitizing units): Should be present and not cracked.

Operational Test

  • Run a complete wash and rinse cycle. Watch for leaks around the door and at plumbing connections.
  • Use your infrared thermometer to measure rinse water temperature at the final rinse. High-temperature sanitizing machines must achieve at least 160°F at the final rinse to meet NSF and health code standards. This is the critical test — a machine that looks clean but doesn't hit sanitizing temperature is non-compliant.
  • Chemical sanitizing machines need verified chemical dispenser function. If possible, test with sanitizer test strips.
  • Listen for unusual pump noise — grinding or cavitation sounds indicate pump wear.

Red Flags

  • Final rinse temperature below 160°F (high-temp units)
  • Chemical dispenser that doesn't prime or deliver correctly
  • Door that won't seal or leaks during cycle
  • Clogged spray arms that can't be cleared
  • Grinding or rattling pump noise

Inspecting Commercial Mixers

A well-maintained Hobart mixer can run 30 years. A neglected one with internal gear damage is a money pit. Inspect accordingly.

Visual Inspection

  • Bowl and attachments: Should be present. Verify the bowl is the correct size for the head. Check for dents on the bowl (affects mixing clearance). Attachments (hook, flat beater, whip) should all be present and not bent.
  • Bowl lift or tilt head mechanism: Operate it. Should move smoothly without resistance or grinding. Bowl should lock securely in the raised position.
  • Drive hub: Look for grease leaking from the attachment hub. Some grease is normal; heavy grease running down the front of the machine indicates a seal failure.
  • Power cord: Check for damage, particularly near the strain relief where cords are flexed repeatedly.
  • Serial number: Photograph it. For Hobart equipment, the serial number tells you the manufacture date. Hobart's date codes allow you to verify the actual age of the unit — a 30-year-old Hobart can be priced and serviced appropriately when you know its age.

Operational Test

  • Run the mixer on all speeds (typically 3 speeds on planetary mixers). Each speed should engage cleanly. Hesitation between speeds or refusal to engage a speed can indicate gear or shifter issues.
  • Listen at each speed for unusual grinding, rattling, or high-pitched bearing noise.
  • With the mixer running, the head should not vibrate excessively. Some vibration is normal at high speed; significant shaking suggests worn bearings or an improperly balanced bowl.
  • Check that the bowl locks firmly when raised and doesn't drop under its own weight.

Red Flags

  • Speed that won't engage or engages with grinding
  • Significant grease leaking from the drive hub (seal failure)
  • Excessive shaking at operating speed (bearing wear)
  • Bowl that won't lock in the raised position

When to Hire a CFESA-Certified Technician

You can do a thorough visual and operational inspection yourself. But for major purchases — anything over $1,500, or any piece of equipment you're betting heavily on — hire a CFESA-certified technician to do a pre-purchase inspection. Source: CFESA

What a CFESA tech does that you can't:

  • Measure refrigerant charge and identify low refrigerant without a manifold gauge set
  • Test electrical circuits for amp draw against spec (identifies motors working too hard, near failure)
  • Pressure test gas connections and verify gas valve function
  • Disassemble and inspect internal components you can't access
  • Provide a written report with repair cost estimates for any identified issues

The cost is typically $100–$200 for a service call inspection. On a $4,000 refrigerator or a $3,500 range purchase, that's the best insurance money you'll spend. If the inspection surfaces $800 in needed repairs, you have real leverage to negotiate the price or walk away with information rather than a surprise after delivery.

Documentation Checklist: What to Get from Every Seller

Before any money changes hands, collect the following:

  • Bill of sale with the buyer's name, seller's name, date, price paid, and full equipment description
  • Model number — verify it matches the physical data plate on the unit
  • Serial number — photograph the data plate directly; don't transcribe from memory
  • Any available service records or maintenance logs — extremely valuable for refrigeration, ice machines, and dishwashers
  • Original owner's manuals — often available as PDFs from manufacturers even if the paper version is gone
  • Confirmation of NSF certification — the NSF mark should be visible on the unit; for food contact equipment, this is required by health departments Source: NSF International

The serial number is particularly important because it allows you to verify actual manufacture date through the manufacturer, confirm the unit is not on a recall list, and establish the true age of the equipment relative to its expected service life.

A seller who resists providing model and serial numbers on a bill of sale is a seller with something to hide. The legitimate used equipment market runs on documentation, and professional dealers always provide it. If you're buying from a private party and they won't put it in writing, reconsider the transaction entirely.