BoilerFaultCodesPotterton Lockout light Fault Code
Also written as LOCKOUTLIGHT — same fault.
The Potterton Lockout light fault code means: your boiler has stopped working because it cannot light its burner or has detected an internal safety problem and shut itself down to prevent damage or risks.. It appears on 2 Potterton models in our database.
Technical description: Indicated by the lockout light being illuminated. Caused by loss of gas supply, flame failure, or over-heating of the central heating water.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Potterton models that show the Lockout light fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton Lockout light fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026