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

Typical repair cost for the Johnson Starley FLUE SENSOR fault is £120-£200 including labour.

FLUE SENSOR High

Johnson Starley FLUE SENSOR Fault Code

Q: What does the Johnson Starley FLUE SENSOR fault code mean?

Your boiler has detected a problem with the sensor that monitors the safety of the exhaust gases, and it has shut down to prevent overheating.

Also written as FLUESENSOR — same fault.

The Johnson Starley FLUE SENSOR fault code means: your boiler has detected a problem with the sensor that monitors the safety of the exhaust gases, and it has shut down to prevent overheating.. It appears on 1 Johnson Starley model in our database.

Technical description: Flue temperature probe is damaged, disconnected, or the resistance does not relate to the actual flue temperature.

Typical repair cost £120-£200 (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 FLUE SENSOR fault code

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

Warmcair DW Repair: £120-£200

Source

Johnson Starley FLUE SENSOR 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