NO LOCKOUT RESET High

Potterton NO LOCKOUT RESET Fault Code

Also written as NOLOCKOUTRESET — same fault.

The Potterton NO LOCKOUT RESET fault code means: your boiler has detected an internal error and is refusing to restart even after you have tried to reset it, meaning it cannot operate safely.. It appears on 1 Potterton model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Lockout will not reset
Typical repair cost £150-350 (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 NO LOCKOUT RESET fault code

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

Source

Potterton NO LOCKOUT RESET 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