Fan Overrun Low

Potterton Fan Overrun Fault Code

Also written as FANOVERRUN — same fault.

The Potterton Fan Overrun fault code means: your boiler is continuing to run its internal fan after the heating or hot water has switched off to safely clear out any leftover gases, which is a normal design feature.. It appears on 1 Potterton model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Control Status: Fan Overrun

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Potterton models that show the Fan Overrun fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Potterton Fan Overrun 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 7 July 2026