BoilerFaultCodesWarmworld Lockout lamp Fault Code
Also written as LOCKOUTLAMP — same fault.
The Warmworld Lockout lamp fault code means: your boiler has switched itself off because it has become too hot or there isn't enough water moving through the system.. It appears on 1 Warmworld model in our database.
Technical description: The flue thermostat has tripped due to exceeding a pre-set temperature or the overheat thermostat has tripped due to insufficient water flow rate.
DIY fix possible
Check that your system water pressure is between 1 and 1.5 barEnsure all radiator valves and the boiler isolation valves are fully openWait for the unit to cool down and try pressing the reset button
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Warmworld models that show the Lockout lamp fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Warmworld Lockout lamp fault code information on this page is sourced and cross-checked against the official Warmworld service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026