What action should be taken if a gas appliance produces yellow flames?

When a gas appliance produces yellow flames, this is an indication of improper combustion. Yellow flames suggest that the fuel is not burning completely, which can lead to the production of carbon monoxide and other harmful byproducts. This situation typically arises from a lack of sufficient air for combustion or an improper gas-to-air mixture.

The appropriate action in this scenario is to check for improper combustion and arrange for servicing. This involves inspecting the appliance to determine the cause of the yellow flames. It may be due to blocked vents, dirty burners, or incorrect adjustment of the appliance. By addressing these issues, you can ensure the appliance operates safely and efficiently.

Increasing the gas pressure or reducing airflow would likely exacerbate the problem by providing more gas without addressing the combustion issue. Replacing the appliance immediately may not be necessary if the problem can be resolved through servicing, making maintenance the most effective and appropriate course of action in response to yellow flames.