Furnace emits a rotten egg or sulfur smell when running
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Possible Causes
How to Fix / Troubleshooting
Emergency safety: If you smell gas (rotten egg odor), do not operate any electrical switches, do not use open flames, and evacuate the area. Call your gas utility or emergency services from outside the home.
- Shut off gas: If safe to do so, close the manual gas shutoff valve to the furnace.
- Ventilate: Open doors and windows to disperse gas.
- Do not relight: Do not attempt to relight or restart the furnace until it has been inspected and cleared by a qualified technician.
Gas leaks and combustion issues are life-threatening and must be handled by professionals.