P 3.1 or higher High

Potterton P 3.1 or higher Fault Code

Also written as P31ORHIGHER — same fault.

The Potterton P 3.1 or higher fault code means: your boiler has detected that the water pressure inside the system is dangerously high while it is running, which can put unnecessary stress on your pipework and internal components.. 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: Pressure indicated at normal working temperatures (80 °C) is too high
Typical repair cost £120-250 (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 P 3.1 or higher fault code

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

Source

Potterton P 3.1 or higher 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 7 July 2026