It’s important to make sure all your gas appliances are installed properly and serviced regularly.

Problems
Contact a Gas Safe Register registered installer immediately if you notice the appliance isn’t working properly. Never try and tackle any repairs or pipe connections yourself.

Warning Signs
Problems with your gas appliances may be indicated by soot deposits around the appliance and/or a yellow/orange flame rather than the normal blue flame. Another sign the appliance isn’t working correctly is excessive condensation in the room.

Smell of Gas
If you smell gas in your home, follow a few simple rules to protect yourself:

1. Open all the doors and windows nearest the smell of gas. It could be that the boiler pilot light has gone out or a gas appliance has been left on e.g. a cooker hob ring. If the light is on and the appliances are all turned off, there may be a gas leak.
2. Turn off the gas at the gas supply meter.
3. Don’t turn on light switches, use the doorbells or any other electrical switches.
4. Do not smoke, light a match or use any other kind of naked flame.

Carbon Monoxide
Carbon monoxide is an invisible, odourless and tasteless gas that can be produced when a gas appliance has not been correctly installed or maintained or the chimney or flue becomes blocked. This is a potentially lethal gas, so follow these simple steps if you suspect there is any danger:

1. If you experience drowsiness, headaches, nausea or pains in the chest when using a gas appliance, switch it off.
2. Open the doors and windows and call the National Grid 24-hour gas emergency line on 0800 111 999.
3. Contact a doctor and mention the possibility of carbon monoxide poisoning.

source: uktv.co.uk