EEPROM LOCKOUT High

Johnson Starley EEPROM LOCKOUT Fault Code

Also written as EEPROMLOCKOUT — same fault.

The Johnson Starley EEPROM LOCKOUT fault code means: your boiler's computer memory has encountered a software error and can no longer process instructions safely.. It appears on 2 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: EEPROM memory fault
Typical repair cost £280-450 (including labour)

DIY fix possible

Locate the main power switch for the boiler (usually a fused spur nearby).Turn the power off for at least 30 seconds.Turn the power back on and wait for the boiler to complete its startup sequence.

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Johnson Starley models that show the EEPROM LOCKOUT fault code

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

Source

Johnson Starley EEPROM LOCKOUT 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 7 July 2026