E05 High

Johnson Starley E05 Fault Code

The Johnson Starley E05 fault code means: your boiler has detected that the internal fan is not spinning correctly, which means the system cannot safely clear away waste gases to start the heating process.. It appears on 11 Johnson Starley models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Fan fault
Typical repair cost £180-350 (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 E05 fault code

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

Source

Johnson Starley E05 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