How much does it cost to fix Potterton error code OVERHEAT LOCKOUT?

Typical repair cost for the Potterton OVERHEAT LOCKOUT fault is £150-300 including labour.

OVERHEAT LOCKOUT High

Potterton OVERHEAT LOCKOUT Fault Code

Q: What does the Potterton OVERHEAT LOCKOUT fault code mean?

Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage to its internal components.

Also written as OVERHEATLOCKOUT — same fault.

The Potterton OVERHEAT LOCKOUT fault code means: your boiler has detected that it is getting too hot and has automatically shut itself down to prevent damage to its internal components.. It appears on 4 Potterton models in our database.

Technical description: Lights: On Off * Off. Possible causes: Flow pipe thermostat (stat) failure, fan stat failure, thermistor (red sensor on flow pipe) failure, combustion chamber door seal damaged, or PCB failure.

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 OVERHEAT LOCKOUT fault code

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

Source

Potterton OVERHEAT 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