BoilerFaultCodesAriston 5P5 Fault Code
The Ariston 5P5 fault code means: your boiler is struggling to detect a consistent supply of gas, which may cause it to fail to ignite or cut out during use.. It appears on 3 Ariston models in our database.
Technical description: Low gas pressure fault (non-blocking)
DIY fix possible
Check that your gas meter has credit (if using a pre-payment meter).Ensure your external gas emergency control valve is fully open.Try to relight other gas appliances, such as a hob, to see if the gas supply is active throughout the home.
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Ariston models that show the 5P5 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ariston 5P5 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 7 July 2026