How much does it cost to fix Potterton error code A (number)?

Typical repair cost for the Potterton A (number) fault is £150-450 including labour.

A (number) High

Potterton A (number) Fault Code

Q: What does the Potterton A (number) fault code mean?

Your boiler has detected a safety concern or internal failure and has shut itself down to prevent damage.

Also written as ANUMBER — same fault.

The Potterton A (number) fault code means: your boiler has detected a safety concern or internal failure and has shut itself down to prevent damage.. It appears on 1 Potterton model in our database.

Technical description: Operating errors or fault lock-out conditions are displayed as A (number) - see chart on Page 7.

What causes the Potterton A (number) fault?

This fault occurs when the boiler's internal sensors detect that the burner has failed to light or maintain a flame safely. The most common reasons include a lack of gas reaching the burner, a worn-out ignition spark, or the control board losing track of the combustion process.

This issue is more frequent during the first cold snap of winter when components that have sat idle all summer are suddenly forced to work under high demand.

Typical repair cost £150-450 (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 A (number) fault code

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

Powermax HE Repair: £150-450

Source

Potterton A (number) 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