How much does it cost to fix Ariston error code 504?

Typical repair cost for the Ariston 504 fault is £90-280 including labour.

504 High

Ariston 504 Fault Code

Q: What does the Ariston 504 fault code mean?

Your boiler has detected that the flame has gone out several times unexpectedly, which has caused it to stop working for safety.

The Ariston 504 fault code means: your boiler has detected that the flame has gone out several times unexpectedly, which has caused it to stop working for safety.. It appears on 1 Ariston model in our database.

Technical description: All Boilers

Typical repair cost £90-280 (including labour)

DIY fix possible

Press the Reset button on the front control panelCheck that your gas pre-payment meter (if you have one) has creditEnsure other gas appliances in your home, such as a hob, are still working correctly

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Ariston models that show the 504 fault code

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

Alteas One Repair: £90-280

Source

Ariston 504 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