BoilerFaultCodesRavenheat lockout Fault Code
Also written as LOCKOUT — same fault.
The Ravenheat lockout fault code means: your boiler has detected that it is getting too hot and has safely switched itself off to prevent damage.. It appears on 1 Ravenheat model in our database.
Technical description: An overheat cut off thermostat set slightly higher than the high limit thermostat acts to turn off the burner to resetable "lockout" (Fig. 50) 3.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Ravenheat models that show the lockout fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ravenheat lockout fault code information on this page is sourced and cross-checked against the official Ravenheat service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026