BoilerFaultCodesPotterton Fan speed Fault Code
Also written as FANSPEED — same fault.
The Potterton Fan speed fault code means: your boiler has stopped working because the internal fan, which safely clears exhaust gases, isn't spinning at the correct speed.. It appears on 2 Potterton models in our database.
Technical description: Fan speed incorrect See chart
What causes the Potterton Fan speed fault?
This fault occurs when the boiler's processor detects that the fan is not rotating fast enough to safely expel waste gases from the flue. The most common reasons are a build-up of dirt within the fan housing, worn-out bearings that cause the motor to seize, or a communication failure between the fan and the main control board.
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 speed fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton Fan speed 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