Warning signs of CO in your home
Sooty or yellow-brown staining around the boiler. A yellow or orange flame instead of blue. Pilot lights blowing out frequently. Increased condensation on windows. A stale, stuffy smell when the boiler runs.
Symptoms of CO poisoning
Headaches, dizziness, nausea, breathlessness, collapse, loss of consciousness. Symptoms often improve when you leave the property and return when you're back — a classic CO clue. If in doubt, get out, call 0800 111 999 and see a doctor.
Fit a CO alarm
An audible CO alarm compliant with EN 50291 is legally required in rental properties with any fuel-burning appliance and strongly recommended in every home. Fit one in each room with a gas appliance, at head height, away from windows and vents.
Annual boiler service
An annual Gas Safe service includes flue gas analysis and combustion checks — the single most effective way to detect CO risk before it becomes dangerous. Landlords are legally required to have a CP12 gas safety certificate renewed every 12 months across KT and TW postcodes.
Worried about CO? Book a Gas Safe check across KT & TW today.
Call 07932 898534Frequently asked questions
Are old boilers more likely to leak CO?
Yes — older boilers, blocked flues and poorly ventilated rooms are the highest risk. Annual servicing catches problems early.
What should I do if my CO alarm sounds?
Open windows, turn off gas appliances, leave the property, call 0800 111 999 and don't return until a Gas Safe engineer has confirmed it's safe.
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