BoilerFaultCodesAriston 501 Fault Code
The Ariston 501 fault code means: your boiler has tried to light several times but has failed to create a flame, meaning you currently have no heating or hot water.. It appears on 6 Ariston models in our database.
Technical description: No flame detected (after 5 ignition attempts)
DIY fix possible
Check if your home gas supply is active by testing another gas appliance like a hob.Verify that your gas prepaid meter (if applicable) has enough credit.If it is freezing outside, check that the white plastic condensate waste pipe is not frozen.Hold the 'Reset' button for five seconds to see if the boiler restarts.
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Ariston models that show the 501 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ariston 501 fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.
- Ariston Alteas One manual (PDF)
- Ariston Clas ONE R manual (PDF)
- Ariston Clas ONE System manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026