A gas safety check involves our Gas Safe registered engineer inspecting your gas appliances. 
We will check the appliance is working correctly and will check the following four areas:
• Gas appliances are on the right setting and burning correctly with the correct operating pressure
• Harmful gases are being removed from the appliance safely to the air outside
• That any ventilation routes are clear and working properly
• All the safety devices are working

The check will identify any defects which require remedial work.