Emergency
Air Flow Monitor Neon on Baxi System 35/60 / 60/100

Your boiler is struggling to breathe because the pipe that vents exhaust gases outside is blocked or faulty, meaning it cannot operate safely.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description

Indicates that the flue or flue terminal is blocked or obstructed in some way, or that there is an internal fault.

Engineer required

This is a emergency severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer
Search the official register →

Related guides you might find useful