CO
Invisible, odourless and tasteless - carbon monoxide (CO) lives up to its name as the silent killer. Exposure to relatively low levels of this highly poisonous gas can cause brain damage or death. 


CO can be produced where a gas appliance has not been correctly installed or maintained, or a flue or chimney has become blocked. Symptoms of CO poisoning are similar to those of viral infections and include drowsiness, weakness, headaches, nausea and pains in the chest. 

If anyone in your house has any of these symptoms when using a gas appliance, stop using the appliance until it has been checked by a CORGI registered installer. Consult a doctor and mention the possibility of carbon monoxide poisoning. 
DANGER SIGNS
Properly installed appliances that are checked regularly by CORGI registered installers should be safe. However, if you notice any of the following telltale danger signs, you should switch off the appliance immediately and notify your registered installer. 
Sooting around the appliance 
A yellow or orange lazy flame 
Excessive condensation in the room where the appliance is installed 
If you suspect a gas leak or an escape of gas, call the Transco 24-hour emergency service on 0800 111 999. 

Physical symptoms of Carbon Monoxide (CO) poisoning

If you experience drowsiness, headaches, nausea or pains in the chest when using a gas appliance, switch it off immediately, contact a doctor and mention the possibility of CO poisoning.