How much does it cost to fix Johnson Starley error code E06?

Typical repair cost for the Johnson Starley E06 fault is £120-210 including labour.

E06 High

Johnson Starley E06 Fault Code

Q: What does the Johnson Starley E06 fault code mean?

Your boiler has detected an electrical fault with the sensor that monitors exhaust gases, causing the system to shut down for safety.

The Johnson Starley E06 fault code means: your boiler has detected an electrical fault with the sensor that monitors exhaust gases, causing the system to shut down for safety.. It appears on 4 Johnson Starley models in our database.

Technical description: Flue thermistor short circuit

Typical repair cost £120-210 (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 E06 fault code

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

C10d Repair: £120-210
C16u Repair: £130-220
C26d Repair: £120-£220
Warmcair DW Repair: £90-160

Source

Johnson Starley E06 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