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.

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.

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

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Lockout fault with a reset-needed pattern.

Older boilers — thermocouple, draught, gas supply.

Safety-critical — turn off, read this.