BoilerFaultCodes Detection Lockout High
Boiler Fault Code Detection Lockout
Also written as DETECTIONLOCKOUT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Detection Lockout appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has stopped working because it cannot detect a flame, meaning it has safely shut down to prevent gas from flowing without being burned. (As reported on Ideal Concord CXC 48 116)
Pick your boiler brand for the Detection Lockout fix
Source
Information for the Detection 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