How much does it cost to fix Potterton error code Safety LOCK-OUT?

Typical repair cost for the Potterton Safety LOCK-OUT fault is £150-300 including labour.

Safety LOCK-OUT High

Potterton Safety LOCK-OUT Fault Code

Q: What does the Potterton Safety LOCK-OUT fault code mean?

Your boiler has stopped working because it failed to light the flame, so it has purposefully shut itself down for safety.

Also written as SAFETYLOCKOUT — same fault.

The Potterton Safety LOCK-OUT fault code means: your boiler has stopped working because it failed to light the flame, so it has purposefully shut itself down for safety.. It appears on 1 Potterton model in our database.

Technical description: Signalled by the red neon if the burner fails to light after automatic ignition sequence repeats.

Typical repair cost £150-300 (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 Safety LOCK-OUT fault code

Click a model for the full fault code list and model-specific repair notes.

Powermax HE Repair: £150-300

Source

Potterton Safety LOCK-OUT 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