FAN FAULT High

Johnson Starley FAN FAULT Fault Code

Also written as FANFAULT — same fault.

The Johnson Starley FAN FAULT fault code means: your boiler has detected a problem with the fan that clears exhaust gases, preventing the unit from starting up for safety reasons.. It appears on 3 Johnson Starley models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Does the wiring from the fan to the PCB have secure connections at both ends and has not deteriorated? Does the wiring have continuity?
Typical repair cost £250-450 (including labour)

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 FAN FAULT fault code

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

Source

Johnson Starley FAN FAULT 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