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Commercial Commercial Griddle: Griddle Won't Heat — Causes & Fixes

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

Quick answer: Start with the owner-level checks. On an electric griddle, confirm it is plugged in, switched ON, and the circuit breaker isn't tripped, and that the thermostat for that section is turned up. On a gas griddle, confirm the main gas shut-off valve is ON and that the standing pilot for that section is lit (each burner section has its own pilot and safety valve; if that pilot is out, its burners get no gas). Because griddles are zoned, one cold section usually means that zone's pilot is out or its thermostat is set below the plate temperature. If the pilot is lit and the thermostat is turned up but the burner still won't fire, or an electric section reads no heat, stop there — the fault is in the gas valve, thermocouple/safety valve, burner, ignition module, or (electric) the heating element and wiring, none of which are owner-serviceable.
Food safety: A griddle that won't reach temperature can leave product below a safe internal cook temperature — the FDA Food Code (3-401.11) requires, for example, ground beef to 155°F and poultry to 165°F. Verify doneness with a probe thermometer and discard undercooked product rather than serving it. 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. Not powered / breaker tripped (electric) or main gas off (gas). Electric: confirm the unit is plugged in, the power switch is ON, and the breaker feeding it is not tripped. Gas: confirm the building's manual gas shut-off valve and the griddle's gas valve are ON.
  2. That zone's thermostat set below plate temperature. On a zoned griddle each 12" section has its own thermostat. A section reading cold may simply have its knob turned down, or the plate is still above the set point so the burner hasn't cycled back on yet.
  3. Standing pilot for that section is out (gas). On standing-pilot griddles there is one pilot and safety valve for roughly every two burners. If a section's pilot is out, the safety valve shuts gas to that section's burners. Look through the pilot sight hole.
  4. Faulty gas valve, thermocouple/safety valve, or low gas pressure (gas). Pilot is lit and the thermostat is turned up, but the burner still won't fire — points to the burner solenoid/gas valve, thermocouple, or low gas pressure.
  5. Failed heating element or wiring (electric). An electric section that reads no heat with power confirmed usually has an open element, a failed thermostat/contactor, or a wiring fault.

Likely causes, checks & fixes

Likely causeHow to checkWhat to doWho
Not powered / breaker tripped (electric) or main gas off (gas)Electric: confirm the unit is plugged in, the power switch is ON, and the breaker feeding it is not tripped. Gas: confirm the building's manual gas shut-off valve and the griddle's gas valve are ON.Plug in and reset the breaker, or open the gas shut-off valve, then turn the thermostat up. If an electric breaker trips again, have an electrician diagnose it.DIY-safe
That zone's thermostat set below plate temperatureOn a zoned griddle each 12" section has its own thermostat. A section reading cold may simply have its knob turned down, or the plate is still above the set point so the burner hasn't cycled back on yet.Set the thermostat for that section to the temperature you want and allow the burner to cycle. Vulcan lists 'cooking surface temp is above set point' as a normal reason a burner does not fire when the knob is set.DIY-safe
Standing pilot for that section is out (gas)On standing-pilot griddles there is one pilot and safety valve for roughly every two burners. If a section's pilot is out, the safety valve shuts gas to that section's burners. Look through the pilot sight hole.Relight the pilot following the manufacturer's lighting procedure (see the how-to). If it lights but that burner still won't fire, or the pilot won't stay lit, call a technician.Basic
Faulty gas valve, thermocouple/safety valve, or low gas pressure (gas)Pilot is lit and the thermostat is turned up, but the burner still won't fire — points to the burner solenoid/gas valve, thermocouple, or low gas pressure.Shut the griddle down and call a qualified gas service technician. Do not adjust gas pressure or the gas valve yourself.Technician
Failed heating element or wiring (electric)An electric section that reads no heat with power confirmed usually has an open element, a failed thermostat/contactor, or a wiring fault.Call a qualified service technician to test line voltage at the element and replace the element or control. This involves high voltage and is not an owner task.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 griddle won't heat?

Start with the owner-level checks. On an electric griddle, confirm it is plugged in, switched ON, and the circuit breaker isn't tripped, and that the thermostat for that section is turned up. On a gas griddle, confirm the main gas shut-off valve is ON and that the standing pilot for that section is lit (each burner section has its own pilot and safety valve; if that pilot is out, its burners get no gas). Because griddles are zoned, one cold section usually means that zone's pilot is out or its thermostat is set below the plate temperature. If the pilot is lit and the thermostat is turned up but the burner still won't fire, or an electric section reads no heat, stop there — the fault is in the gas valve, thermocouple/safety valve, burner, ignition module, or (electric) the heating element and wiring, none of which are owner-serviceable.

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: Faulty gas valve, thermocouple/safety valve, or low gas pressure (gas); Failed heating element or wiring (electric). 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