BoilerFaultCodesPotterton Air Flow Monitor Neon Fault Code
Also written as AIRFLOWMONITORNEON — same fault.
The Potterton Air Flow Monitor Neon fault code means: your boiler has detected an issue with how it is venting exhaust gases, which has caused it to shut down for safety.. It appears on 1 Potterton model in our database.
Technical description: Indicates that the flue or flue terminal is blocked or obstructed in some way, or that there is an internal fault.
What causes the Potterton Air Flow Monitor Neon fault?
This fault occurs when the boiler's safety sensors detect that harmful exhaust gases are not being cleared from the system effectively. The most common reasons are a buildup of debris in the fan or air tubes, or a mechanical failure in the switch that confirms the fan is spinning fast enough to operate safely.
This issue is frequently seen during periods of high winds, which can create back-pressure in the flue, or in autumn when falling leaves can physically block the external terminal.
DIY fix possible
Check the external flue pipe on the outside wall for any visual obstructions like bird nests, leaves, or debris.Ensure there is nothing leaning against or covering the flue terminal.Turn the selector switch to the reset position for five seconds and then back to the required setting.
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Gas Safe Register →Potterton models that show the Air Flow Monitor Neon fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton Air Flow Monitor Neon fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026