How much does it cost to fix Johnson Starley error code E02?

Typical repair cost for the Johnson Starley E02 fault is £120-280 including labour.

E02 High

Johnson Starley E02 Fault Code

Q: What does the Johnson Starley E02 fault code mean?

Your boiler thinks a flame is burning even though it hasn't been told to start yet, which is causing it to lock itself down for safety.

The Johnson Starley E02 fault code means: your boiler thinks a flame is burning even though it hasn't been told to start yet, which is causing it to lock itself down for safety.. It appears on 11 Johnson Starley models in our database.

Technical description: False flame signal

Typical repair cost £120-280 (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 E02 fault code

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

C10d Repair: £120-280
C16d Repair: £120-£350
C16u Repair: £120-350
C26d Repair: £120-280
Comet 100 Repair: £120-280
Comet 60 Repair: £140-280
Comet 80 Repair: £120-350
Optima E20 Repair: £120-280
Warmaflow F80E Repair: £100-280
Warmaheat Repair: £120-£280
Warmcair DW Repair: £90-180

Source

Johnson Starley E02 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