How much does it cost to fix Potterton error code Lockout light?

Typical repair cost for the Potterton Lockout light fault is £120-250 including labour.

Lockout light High

Potterton Lockout light Fault Code

Q: What does the Potterton Lockout light fault code mean?

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.

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 3 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.

Typical repair cost £120-250 (including labour)

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 27 April 2026