F07 High

Johnson Starley F07 Fault Code

The Johnson Starley F07 fault code means: your boiler has detected an issue with the sensor that monitors the safety of the exhaust gases, and it has shut down to prevent potential overheating.. It appears on 6 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: Exhaust sensor fault
Typical repair cost £120-£240 (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 F07 fault code

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

Source

Johnson Starley F07 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 27 April 2026