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Commercial Commercial Griddle: Pilot Or Burner Won't Ignite — Causes & Fixes

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

Quick answer: Owner-level: make sure the main gas shut-off valve is ON, then follow the manufacturer's pilot-lighting procedure exactly — turn everything OFF and wait 5 minutes to clear any gas, turn the gas on, then depress and hold the safety-valve button while lighting the pilot through the sight hole, holding about 45 seconds before releasing. If the pilot won't light or won't stay lit after a couple of tries, or an electronic-ignition model sparks but won't light, stop — the cause is in the pilot orifice, thermocouple/safety valve, ignition module/electrode, gas valve, or gas pressure, and all of those are technician-only on a gas griddle. Never disassemble or adjust gas or ignition parts yourself.
Food safety: While the griddle is down, don't hold raw or partially cooked product in the temperature danger zone (41°F-135°F, per FDA Food Code). Move product to refrigeration and cook to required internal temperatures once the unit is running. 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. Main gas off, or air in a new/idle gas line. Confirm the manual gas valve and the griddle gas valve are ON. After a new install or a long shutdown, air in the line makes the pilot hard to light and slow to hold.
  2. Obstructed or wrong-size pilot orifice. A clogged or incorrect pilot orifice gives a weak pilot that won't light or won't stay lit.
  3. Failing thermocouple / pilot safety valve. The thermocouple senses the pilot and holds the safety valve open; a weak or loose one lets the valve close and drop the pilot right after you release the button.
  4. Ignition module or electrode fault (electronic-ignition models). On electronic-ignition griddles, no spark or spark-but-no-flame points to the safety-ignition module, electrode/sensor, or its wiring.
  5. Low gas pressure or pilot blown out by drafts. Low supply pressure, or air blowing across the pilot from a fan or open door, can keep the pilot from lighting or holding.

Likely causes, checks & fixes

Likely causeHow to checkWhat to doWho
Main gas off, or air in a new/idle gas lineConfirm the manual gas valve and the griddle gas valve are ON. After a new install or a long shutdown, air in the line makes the pilot hard to light and slow to hold.Open the gas valves and follow the lighting procedure; hold the safety-valve button longer to purge air from the pilot line, as the manual describes. If it still won't light, call a technician.Basic
Obstructed or wrong-size pilot orificeA clogged or incorrect pilot orifice gives a weak pilot that won't light or won't stay lit.Cleaning or replacing the pilot orifice is a gas-technician task. Call a qualified servicer.Technician
Failing thermocouple / pilot safety valveThe thermocouple senses the pilot and holds the safety valve open; a weak or loose one lets the valve close and drop the pilot right after you release the button.A loose thermocouple connection may only need tightening by a technician; a failed thermocouple or safety valve must be replaced by a qualified servicer. Not an owner-serviceable part.Technician
Ignition module or electrode fault (electronic-ignition models)On electronic-ignition griddles, no spark or spark-but-no-flame points to the safety-ignition module, electrode/sensor, or its wiring.Call a qualified technician to test and replace the ignition module or electrode. This is not owner-serviceable.Technician
Low gas pressure or pilot blown out by draftsLow supply pressure, or air blowing across the pilot from a fan or open door, can keep the pilot from lighting or holding.Remove drafts near the griddle (the manual warns against fans and open windows blowing on it). If pressure is suspect, have a technician verify gas pressure — never adjust the regulator yourself.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 pilot or burner won't ignite?

Owner-level: make sure the main gas shut-off valve is ON, then follow the manufacturer's pilot-lighting procedure exactly — turn everything OFF and wait 5 minutes to clear any gas, turn the gas on, then depress and hold the safety-valve button while lighting the pilot through the sight hole, holding about 45 seconds before releasing. If the pilot won't light or won't stay lit after a couple of tries, or an electronic-ignition model sparks but won't light, stop — the cause is in the pilot orifice, thermocouple/safety valve, ignition module/electrode, gas valve, or gas pressure, and all of those are technician-only on a gas griddle. Never disassemble or adjust gas or ignition parts yourself.

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: Obstructed or wrong-size pilot orifice; Failing thermocouple / pilot safety valve; Ignition module or electrode fault (electronic-ignition models). 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