502 High

Ariston 502 Fault Code

The Ariston 502 fault code means: your boiler thinks it sees a flame even though the gas should be turned off, so it has shut down as a safety precaution.. It appears on 6 Ariston models 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: Flame detected with gas valve closed
Typical repair cost £140-£350 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ariston models that show the 502 fault code

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

Source

Ariston 502 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