Quick Answer
Warning signs of a gas cooktop leak include a distinct rotten-egg smell, a hissing sound near the cooktop, a yellow or orange flame instead of blue, and unexplained discomfort like headaches or dizziness in the kitchen — any of these require immediate action.
Natural gas suppliers add a distinctive sulphur-like smell specifically so leaks are noticeable — never ignore this smell even if it seems faint.
A gas leak from your cooktop is a genuine safety emergency, not a routine repair. Knowing the warning signs — and exactly what to do — can prevent a serious incident.
Warning Signs of a Gas Leak
- A distinct rotten-egg or sulphur-like smell near the cooktop
- A hissing sound coming from the cooktop or gas line
- A yellow or orange flame instead of a strong blue flame
- Soot or dark marks around the burners
- Unexplained headaches, dizziness or nausea while in the kitchen
- Plants near a gas appliance dying unexpectedly (a less obvious sign)
What to Do Immediately
- Turn off the gas at the isolation valve or mains if it's safe to do so
- Open windows and doors for ventilation
- Avoid using light switches, phones, or anything that could create a spark
- Leave the house if the smell is strong
- Call a licensed gas technician or your gas provider's emergency line immediately
How Technicians Find and Fix the Leak Source
A licensed gas fitter uses specialised leak-detection equipment to pinpoint the exact source — often a loose fitting, a worn seal, or a damaged line — then repairs and pressure-tests the system before confirming it's safe to use again.
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Frequently Asked Questions
What does a gas leak smell like?▼
Natural gas is given a distinctive rotten-egg or sulphur-like smell specifically so leaks are noticeable, even at low concentrations.
Is it safe to look for a gas leak myself?▼
Visually checking for obvious signs is fine, but never use a flame to search for a leak, and always call a licensed gas technician for confirmation and repair.
What should I do first if I smell gas?▼
Turn off the gas supply if safe, ventilate the area, avoid creating any spark, and call a licensed gas technician immediately.
Can a yellow gas flame mean a leak?▼
A yellow flame more often indicates incomplete combustion rather than a leak specifically, but it should still be checked promptly by a licensed technician.
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Dishank Patel
Lead Technician & Founder · DP Electric Melbourne
Dishank Patel has over 10 years of hands-on experience repairing household appliances across Melbourne's eastern suburbs. He holds all required Victorian electrical and gas licensing and has personally repaired thousands of appliances across brands including Bosch, Miele, LG, Samsung, and Fisher & Paykel.