BoilerFaultCodesJohnson Starley Faulty fan Fault Code
Also written as FAULTYFAN — same fault.
The Johnson Starley Faulty fan fault code means: your boiler's air circulation system has stopped working because the mechanical unit that pushes air through the vents isn't receiving the correct power to start up.. It appears on 1 Johnson Starley model in our database.
Technical description: Measured voltage within Low Voltage fan connector (blue & yellow) is greater than 2V but fan is not running.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Johnson Starley models that show the Faulty fan fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Johnson Starley Faulty fan fault code information on this page is sourced and cross-checked against the official Johnson Starley service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026