1p2 High

Ariston 1p2 Fault Code

Also written as 1P2 — same fault.

The Ariston 1p2 fault code means: your boiler is not circulating water correctly, meaning it is sensing that the temperature is rising too quickly and has stopped to prevent overheating.. It appears on 1 Ariston 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: All Boilers
Typical repair cost £120-350 (including labour)

DIY fix possible

Check that your boiler pressure is between 1.0 and 1.5 bar on the display.Ensure all radiator valves and isolation valves under the boiler are fully open.Bleed your radiators to remove any trapped air that might be blocking water flow.

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Ariston models that show the 1p2 fault code

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

Source

Ariston 1p2 fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026