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Commercial Commercial Griddle: Uneven Heat, Cold Spots, Or Hot Spots — Causes & Fixes

Compiled by Resultex Media Group · Editorially reviewed · Last verified August 2026

Quick answer: The two most common owner-fixable causes are an unlevel griddle and a dirty/carbonized plate. A griddle must be level side-to-side and front-to-back, or grease pools and heat spreads unevenly, creating cold spots; the manufacturer specifically warns that improper leveling causes uneven temperature distribution and cold spots. Carbonized grease on the surface also insulates the plate and gives spotty browning. Level the unit, deep-clean and reseason the plate, and remember zoned griddles are meant to run different sections at different temperatures. If it's still uneven after leveling and cleaning, the cause is a thermostat out of calibration (see the calibration check) or, deeper, a burner or element problem that needs a technician.
Food safety: Cold spots can leave product in one area below a safe internal temperature even when the rest looks done. Check doneness with a probe thermometer across the whole plate, not just the hot zone (FDA Food Code 3-401.11). Note: returning food to 41°F does not by itself make it safe. If the time/temperature history is unknown, segregate the product and follow your food-safety plan; the FDA Food Code’s time-as-a-public-health-control provisions require specific written procedures, and local health-department requirements may differ. When safety cannot be verified, discard it.

Check in this order (5-minute diagnostic)

Work top to bottom — the quickest, most-likely checks are first.

  1. Griddle not level. Place a level on the plate front-to-back and side-to-side. An unlevel plate pools grease and distributes heat unevenly.
  2. Carbonized grease / dirty plate insulating the surface. A hard film of carbonized grease on the plate hinders heat transfer from the surface to the food, causing spotty browning and loss of efficiency.
  3. Thermostat out of calibration (thermostatic models). If a zone browns hotter or cooler than its dial setting after leveling and cleaning, do a calibration check: set 350°F, let it stabilize through at least two on/off cycles, and measure the plate center with a surface probe.
  4. Air currents blowing across the griddle. A fan, open window, or door blowing on the griddle cools one area and skews burner performance.
  5. Burner or heating-element fault. One zone consistently cold or weak after leveling, cleaning, and calibration points to a partially blocked burner, loose/failed element clamp, or failing element/valve.

Likely causes, checks & fixes

Likely causeHow to checkWhat to doWho
Griddle not levelPlace a level on the plate front-to-back and side-to-side. An unlevel plate pools grease and distributes heat unevenly.Level the unit by adjusting the bullet feet at the bottom of each leg (turn counter-clockwise to raise, clockwise to lower); don't extend legs more than 1-3/4". Re-level any time the griddle is moved.DIY-safe
Carbonized grease / dirty plate insulating the surfaceA hard film of carbonized grease on the plate hinders heat transfer from the surface to the food, causing spotty browning and loss of efficiency.Deep-clean the plate with a griddle stone/screen with the grain while warm (not hot), remove all detergent with clear water, then reseason. Clean after each use to prevent buildup.DIY-safe
Thermostat out of calibration (thermostatic models)If a zone browns hotter or cooler than its dial setting after leveling and cleaning, do a calibration check: set 350°F, let it stabilize through at least two on/off cycles, and measure the plate center with a surface probe.If the measured temperature is more than the manufacturer's tolerance off (Vulcan spec is 350°F +/-15°F), recalibrate the dial per the manual or have a technician do it. Never turn the center screw on the thermostat shaft.Basic
Air currents blowing across the griddleA fan, open window, or door blowing on the griddle cools one area and skews burner performance.Remove or redirect the airflow; the manufacturer warns not to let air blow directly at the griddle and to avoid wall-type fans nearby.DIY-safe
Burner or heating-element faultOne zone consistently cold or weak after leveling, cleaning, and calibration points to a partially blocked burner, loose/failed element clamp, or failing element/valve.Call a qualified technician to inspect the burner and gas valve (gas) or test and reseat/replace the element (electric).Technician

Who can do it: DIY-safe owner-doable · Basic simple part swap · Technician refrigerant/gas/electrical — call a licensed pro.

How to do the safe fixes

Owner-doable procedures only. Anything on the "Technician" list above needs a licensed pro.

Season the griddle plate DIY-safe
  1. On a brand-new griddle, first remove the factory rust-inhibitor coating: heat to 200-300°F to loosen it, clean with a non-corrosive grease-dissolving cleaner, rinse, and wipe dry.
  2. Heat the plate to a low temperature, about 300-350°F.
  3. Apply a small amount of cooking oil - about one ounce per square foot of surface.
  4. Spread the oil into a thin film over the entire surface with a soft lint-free cloth, then wipe off any excess.
  5. Repeat the oil-and-wipe procedure two to three times until the plate has a slick, mirror-like finish.
  6. Reseason any time you strip the plate with soap and water or after a heavy cleaning.

· Tools: Food-grade cooking oil, Soft lint-free cloth, Non-corrosive grease-dissolving cleaner (for first-use film removal) · Source: Vulcan/Wolf Medium Duty Gas Griddle IOM (Before First Use; Seasoning the Griddle); Garland G Series IOM (seasoning procedure)

Clean the griddle (daily and weekly) DIY-safe
  1. After each use, scrape and clean the plate with a griddle brush or flexible spatula and draw grease into the trough; avoid gouging the steel.
  2. Once a day, empty and wash the grease drawer and clean the backsplash, sides, and front.
  3. Once a week (more with heavy use), deep-clean the plate with a griddle stone/screen/pad, rubbing with the grain while the plate is warm - not hot - to avoid thermal shock.
  4. If you use detergent on the plate, flush it off completely with clear water so none remains.
  5. Reseason the plate after any cleaning that removes the seasoning.
  6. Wipe stainless surfaces with a damp cloth and polish dry; use a griddle cleaner for discoloration.

· Tools: Griddle brush or flexible spatula, Griddle stone, screen, or non-scratch pad, Mild detergent (weekly, optional) and clear water, Cloth for stainless surfaces · Source: Vulcan/Wolf Medium Duty Gas Griddle IOM (Cleaning the Griddle - after each use / once per day / once per week)

Check thermostat calibration (thermostatic models) Basic
  1. Set the zone's thermostat to 350°F and let it stabilize, allowing the burner to cycle ON and OFF at least twice.
  2. Locate the zone-center measuring point: start 6" from the side splash and every 12" across the width, all points 12" back from the front edge.
  3. Watch for the burner to cycle OFF, then measure the plate temperature at that point with a surface probe (infrared thermometers are not recommended - they're sensitive to surface color, angle, and distance).
  4. Compare to the dial: it should read 350°F +/-15°F. If it's within tolerance, the control is fine.
  5. If out of tolerance, recalibrate the dial per the manual - loosen the knob set screw and remove the knob, loosen the temperature-dial screws, rotate the dial so the arrow matches the measured temperature, then retighten and verify.
  6. IMPORTANT: never turn the screw in the center of the thermostat shaft - that destroys the factory calibration and can ruin the thermostat.

· Tools: Surface-probe (contact) thermometer - not an infrared thermometer · Source: Vulcan/Wolf Medium Duty Gas Griddle IOM (Adjustments - Calibration)

Relight a standing pilot (per manual) Basic
  1. Turn the main gas shut-off valve and all thermostats to OFF and wait 5 minutes to let any accumulated gas escape (if you still smell gas after 5 minutes, stop and ventilate - do not light).
  2. Turn the main gas shut-off valve ON.
  3. Depress and hold the safety-valve button for that section while lighting the corresponding pilot with an outside ignition source, viewing through the pilot sight hole (you'll reach under the front of the unit).
  4. After the pilot gas has been burning about 45 seconds, release the safety-valve button. If the pilot doesn't stay lit, repeat and hold longer (a new install or a long shutdown needs more time to purge air).
  5. Repeat for each section's pilot until all are lit, then set the thermostats to the desired temperatures.
  6. If a pilot still won't light or stay lit after a couple of tries, turn off the main gas shut-off valve and call an authorized service contractor - do not adjust the pilot orifice, thermocouple, or gas valve yourself.

· Tools: Long match, lit taper, or long-reach lighter · Source: Vulcan/Wolf Medium Duty Gas Griddle IOM (Pilot Lighting Procedure)

Stop and call a qualified technician if:
Repair or replace? A gasket, coil cleaning, or a simple part is almost always worth fixing. Weigh replacement when the unit needs a compressor or sealed-system repair and is roughly 8–10+ years old, or when repeated service calls approach the cost of a new unit. Compare current commercial griddles →

Related commercial griddle problems

Frequently asked questions

Why is my commercial griddle uneven heat, cold spots, or hot spots?

The two most common owner-fixable causes are an unlevel griddle and a dirty/carbonized plate. A griddle must be level side-to-side and front-to-back, or grease pools and heat spreads unevenly, creating cold spots; the manufacturer specifically warns that improper leveling causes uneven temperature distribution and cold spots. Carbonized grease on the surface also insulates the plate and gives spotty browning. Level the unit, deep-clean and reseason the plate, and remember zoned griddles are meant to run different sections at different temperatures. If it's still uneven after leveling and cleaning, the cause is a thermostat out of calibration (see the calibration check) or, deeper, a burner or element problem that needs a technician.

When should I call a technician instead of fixing it myself?

Call a licensed technician for anything involving the sealed system, refrigerant, gas, or high-voltage wiring — for example: Burner or heating-element fault. These are diagnostic-only for an operator.

Is it worth repairing or replacing?

Simple fixes (gaskets, coil cleaning, a single part) are worth repairing. Consider replacing when it needs a compressor or sealed-system repair and is 8–10+ years old, or when repeat service calls near the price of a new unit.

Sources