If the pilot on a commercial range keeps going out, treat it as a gas safety problem, not a nuisance. If you smell gas, leave the building and call the gas utility from outside before doing anything else. If there is no gas smell, the usual causes are a worn thermocouple, a dirty or misplaced pilot, a draft, or a gas supply or valve problem. Repeated relighting does not fix any of these and can hide a real danger.
What to do first
Gas safety comes before any repair. If you smell gas, or hear a hissing sound near the range, do not touch light switches, plug in or unplug equipment, or use a phone inside the kitchen. Leave the building, bring your staff with you, and call the gas utility from outside. Wait for the utility to say it is safe to go back in. Do not try to find the leak yourself.
If there is no smell of gas, shut off the gas valve to the burner or the range, and let the area air out on its own for several minutes before you attempt anything. Do not relight a pilot more than once or twice. If it will not stay lit, stop and call for service.
Why the pilot goes out
A worn or misaligned thermocouple
On many ranges the pilot is held on by a thermocouple, a small sensor in the pilot flame that tells the gas valve the flame is present. When it weakens, it stops signaling and the gas valve closes. A thermocouple that is bent, coated with soot or no longer sitting in the flame properly is a very common reason for a pilot that lights and then drops out.
Dirt and grease in the pilot
The pilot orifice is tiny. Grease, food and rust can partly block it, giving a weak, yellow or flickering flame that cannot heat the sensor properly. Grease from a boil-over runs down into places you cannot see.
Drafts and ventilation changes
A hood that pulls too hard, a new door, a fan blowing across the range or a change in makeup air can blow out a pilot. If the pilot goes out at certain times of day, such as when the exhaust fan runs on high, the airflow in the kitchen may be the reason.
Gas supply and regulator problems
Low gas pressure, a partly closed valve or a failing regulator can starve the pilot. Because many appliances share a gas line, other equipment may act oddly at the same time. Gas pressure should be measured by a qualified technician, not guessed at.
A failing safety valve
The safety valve holds gas back unless it sees a flame signal. If the valve itself is worn, it may close even when the sensor is working.
| What happens | Possible cause | Action |
|---|---|---|
| Pilot lights, then drops out when button is released | Weak thermocouple or poor flame contact | Technician |
| Yellow, weak or flickering pilot | Dirty pilot orifice or poor air | Technician |
| Pilot goes out when hood or fans run | Draft or airflow issue | Technician and kitchen review |
| Several burners misbehave at once | Low gas pressure or regulator | Technician or utility |
| Smell of gas | Possible leak | Leave, call gas utility from outside |
What staff should not do
Do not hold the pilot button down for an extended time to force the flame to stay. Do not use a lighter or match inside an oven or range cabinet when you smell gas. Do not bypass or tape over a safety control. Do not clean inside burner compartments with water on a hot range. Each of these either hides the cause or adds risk.
What a technician checks
A technician starts with a gas leak check on the range connections, then measures supply and manifold pressure. They clean the pilot and orifice, test the thermocouple output with a meter, check the safety valve, and inspect the flue and ventilation path. If a part is worn, such as a thermocouple or a pilot assembly, it is replaced with a compatible part. Some answers are not known until the range has been pulled apart, so we explain what has been confirmed and what we still need to test. We give a written price before starting repair work.
Reducing the risk going forward
Keep burners and the area under the cooktop clean so grease does not reach the pilot. Make sure staff know where the gas shutoff is and what to do if they smell gas. Schedule periodic service on gas equipment, especially in older kitchens where parts are worn. Check that the hood and makeup air are balanced. Older ranges can often be kept running safely when they are maintained.
We repair gas and electric ranges, including older ones, and same-day appointments are often available. We confirm a three-hour arrival window when you book.
FAQ
Is it okay to keep relighting the pilot?
No. If it will not stay lit after one or two attempts, stop and call a technician, because the cause is often a safety-related part.
How do I know if I have a gas leak?
Signs include a rotten-egg odor, a hissing sound or a pilot that behaves oddly. If you notice any, leave the building and call the gas utility from outside.
Can a draft really blow out a pilot?
Yes. Strong hood suction, fans or a door opening in a certain way can disturb a small pilot flame.
Do you service older commercial ranges?
Yes. We work on older gas and electric ranges and explain what parts are available.