How much does it cost to fix Johnson Starley error code ER 09 + SPANNER?

Typical repair cost for the Johnson Starley ER 09 + SPANNER fault is £120-£220 including labour.

ER 09 + SPANNER High

Johnson Starley ER 09 + SPANNER Fault Code

Q: What does the Johnson Starley ER 09 + SPANNER fault code mean?

Your boiler has detected a communication problem with the safety sensor that monitors exhaust gases, causing the system to shut down for safety.

Also written as ER09SPANNER — same fault.

The Johnson Starley ER 09 + SPANNER fault code means: your boiler has detected a communication problem with the safety sensor that monitors exhaust gases, causing the system to shut down for safety.. It appears on 1 Johnson Starley model in our database.

Technical description: Flue sensor open circuit (out of range - resistance too high)

Typical repair cost £120-£220 (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 ER 09 + SPANNER fault code

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

Warmcair DW Repair: £120-£220

Source

Johnson Starley ER 09 + SPANNER 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