How much does it cost to fix boiler error code ADC LOCKOUT?

Typical repair cost for the boiler ADC LOCKOUT fault is £220-450 including labour.

ADC LOCKOUT High

Boiler Fault Code ADC LOCKOUT

Also written as ADCLOCKOUT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code ADC LOCKOUT appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's computer brain is having trouble processing information from its internal sensors and has shut down for safety. (As reported on Johnson Starley J32 System ET)

Pick your boiler brand for the ADC LOCKOUT fix

Johnson Starley ADC LOCKOUT 1 model

Source

Information for the ADC LOCKOUT fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026