Determining whether your furnace has a natural gas leak involves relying on sensory indicators and safety checks. The most distinct sign is an unmistakable, pungent sulfur or rotten egg odor added to the fuel. You can also listen closely near the gas control valve and supply piping for a faint hissing, blowing, or whistling sound indicating escaping gas. Additionally, you can apply a soapy water solution to pipe joints and fittings; if gas is leaking, bubbles will rapidly form. If you suspect a leak, never use open flames or electrical switches, evacuate the building immediately, and contact your utility provider. You can verify that a repair was successful when professional gas detectors register zero readings.
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