How much does it cost to fix Johnson Starley error code 26?

Typical repair cost for the Johnson Starley 26 fault is £120-350 including labour.

26 High

Johnson Starley 26 Fault Code

Q: What does the Johnson Starley 26 fault code mean?

Your boiler is struggling to keep its burner lit and has shut down for safety after failing to detect a steady flame several times.

The Johnson Starley 26 fault code means: your boiler is struggling to keep its burner lit and has shut down for safety after failing to detect a steady flame several times.. It appears on 10 Johnson Starley models in our database.

Technical description: Flame lost signal lost 5 times in 4 minutes. Flame sensing error. Failing gas pressures. Fan fault. Flue blockage. Check flame detection lead between sensor and ignition control board. Check the gas supply, does pressure fall when burner fires? Check that flue system is not blocked.

Typical repair cost £120-350 (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 26 fault code

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

Source

Johnson Starley 26 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