Circulation LOCKOUT High

Potterton Circulation LOCKOUT Fault Code

Also written as CIRCULATIONLOCKOUT — same fault.

The Potterton Circulation LOCKOUT fault code means: your boiler has detected that hot water isn't moving around your radiators or pipes properly and has shut itself down to prevent overheating.. 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: Inadequate circulation checked by casting thermistor; trips 4 times during a call for heat.
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 Circulation LOCKOUT fault code

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

Source

Potterton Circulation LOCKOUT 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