Emergency Carbon Monoxide Investigation

What this emergency service covers

If there’s a risk of carbon monoxide, the priority is to reduce danger quickly and confirm whether appliances can be used safely.

• Initial safety checks and assessment of the situation
• Testing of suspected appliances and surrounding areas using appropriate equipment
• Inspection of flues, ventilation and signs of incomplete combustion
• Isolation of any appliance or supply that is unsafe, with clear explanations of why
• Practical guidance on next steps, from immediate repairs to further specialist work
• Advice for restoring heating and hot water safely where possible

When to book an emergency CO investigation

This service is most relevant when time matters and you need a qualified, practical assessment.

Common situations include:

• A carbon monoxide alarm has sounded, even if it later stops
• Anyone has symptoms such as headaches, dizziness, nausea or confusion, especially at home
• Sooting, yellow flames, staining around an appliance, or unusual smells from a boiler or heater
• Concerns after recent work to a boiler, fire, cooker or flue

If anyone feels seriously unwell, move to fresh air and call 999. If you can smell gas, call the National Gas Emergency Service on 0800 111 999.

What happens during the visit

You can expect a calm, methodical approach focused on safety and clear communication.

Typically, the visit includes:

• Questions about the alarm, symptoms, and what appliances have been running
• Ventilation and flue checks where relevant
• Testing around appliances and in affected areas
• Making equipment safe, which may include turning off and labelling an appliance or isolating a supply
• A clear explanation of findings and what needs to happen before anything is used again

After the investigation: repairs and next steps

Once the immediate risk is managed, you’ll be guided through the most sensible route forward.

Depending on what’s found, this may include:

• A recommended repair plan and quote
• Parts sourcing and a return visit if components are needed
• Further checks after remedial work, to confirm safe operation
• Advice for landlords or businesses on what documentation may be appropriate for their situation