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    Q657: What do I do if I think that an appliance is leaking carbon monoxide?

    • Switch off the appliance immediately.
    • Do not use again until repaired/replaced.
    • Shut off the gas at the supply.
    • Call National Grid on 0800 111 999.
    • Open all doors and windows to ventilate the room.
    • Contact your GP/casualty or an ambulance depending on the seriousness of the effects.
    • Ensure the appliance is fixed/repaired by a Gas Safe registered repairer.

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