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

Typical repair cost for the Potterton APS Cycling LOCKOUT fault is £150-250 including labour.

APS Cycling LOCKOUT High

Potterton APS Cycling LOCKOUT Fault Code

Q: What does the Potterton APS Cycling LOCKOUT fault code mean?

Your boiler has detected an issue with its internal ventilation system four times in a row, causing it to shut down for safety reasons.

Also written as APSCYCLINGLOCKOUT — same fault.

The Potterton APS Cycling LOCKOUT fault code means: your boiler has detected an issue with its internal ventilation system four times in a row, causing it to shut down for safety reasons.. It appears on 1 Potterton model in our database.

Technical description: The Air Pressure Switch is not maintaining its signal. This has occurred 4 times.

Typical repair cost £150-250 (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 APS Cycling LOCKOUT fault code

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

Suprima HE Repair: £150-250

Source

Potterton APS Cycling 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