Why Is Gas Oven Smelling Like Gas

A gas smell from your oven is something that should never be ignored. While some gas odour during ignition is normal, a persistent or strong gas smell is a potential safety emergency. Here's how to assess the situation and what to do.

When to Act Immediately: Emergency Situations

If you smell gas strongly and it doesn't clear within a minute or two, treat it as an emergency:

1. Do not turn any electrical switches on or off — electrical sparks can ignite gas
2. Do not use your phone inside the house — go outside first
3. Turn off the gas supply valve — usually located behind or beneath the oven, or at the main gas meter
4. Open all windows and doors to ventilate
5. Leave the house and call your gas supplier's emergency line or emergency services from outside

Normal: Brief Gas Smell During Ignition

A brief, faint gas smell for 1–2 seconds during ignition is normal — this is the small amount of gas released before the igniter lights it. It should disappear immediately once the burner lights. If the smell clears within seconds of the flame lighting, this is not a concern.

Cause 1: Delayed Ignition

Signs: Gas smell lasts several seconds before the burner lights; sometimes accompanied by a small "pop" when it finally ignites.

Delayed ignition means gas is accumulating before the igniter fires. This is caused by a weak igniter, dirty igniter, or low gas pressure. The accumulated gas ignites all at once, creating a small explosion and a brief gas smell.

Risk: Moderate — repeated delayed ignition can damage the oven and is a fire risk.

Fix: Clean or replace the igniter. Have the gas pressure checked by a gas engineer.

Cause 2: Flame Has Gone Out During Cooking

Signs: Gas smell develops during cooking; oven temperature drops; no visible flame.

If the oven flame goes out during cooking (due to a faulty thermocouple, draught, or other cause), unburned gas continues to flow briefly before the safety valve cuts it off. Modern ovens have safety valves that stop gas flow within seconds of flame loss — but older ovens may not.

Fix: Turn off the oven immediately, ventilate, and wait 5 minutes before relighting. Investigate why the flame went out — see our guide on gas oven flame going out.

Cause 3: Gas Leak from Connections

Signs: Persistent gas smell even when the oven is off; smell is stronger near the back of the oven or the gas connection point.

A loose or damaged gas connection at the back of the oven can leak gas continuously. This is a serious safety issue.

Diagnosis: With the oven off, apply soapy water to the gas connection fittings at the back of the oven. Bubbles indicate a leak.

Fix: Do not attempt to repair gas connections yourself. Turn off the gas supply and call a qualified gas engineer immediately.

Cause 4: Faulty Gas Valve Not Closing Fully

Signs: Faint gas smell when the oven is off; smell is coming from inside the oven cavity.

A faulty gas valve may not close completely when the oven is turned off, allowing a small amount of gas to seep through.

Fix: Turn off the gas supply and call a qualified gas engineer. Gas valve repair or replacement must be done by a professional.

Install a Carbon Monoxide Detector

Gas appliances can also produce carbon monoxide — an odourless, colourless gas that is fatal in enclosed spaces. A CO detector provides essential protection that a gas smell alone cannot. The Kidde Carbon Monoxide Detector with Digital Backlit Display provides audible and visual alerts — essential for any home with gas appliances.

Summary

A brief gas smell during ignition is normal. A persistent or strong gas smell is a potential emergency — turn off the gas supply, ventilate, and call a gas engineer. Never ignore a gas smell that doesn't clear within seconds of the burner lighting.