How much does it cost to fix Ariston error code 5 0 2?

Typical repair cost for the Ariston 5 0 2 fault is £150-300 including labour.

5 0 2 Emergency

Ariston 5 0 2 Fault Code

Q: What does the Ariston 5 0 2 fault code mean?

Your boiler has detected that a flame is present even though it has commanded the gas supply to shut off.

Also written as 502 — same fault.

The Ariston 5 0 2 fault code means: your boiler has detected that a flame is present even though it has commanded the gas supply to shut off.. It appears on 1 Ariston model in our database.

Technical description: Detection of flame with gas valve closed

Typical repair cost £150-300 (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 5 0 2 fault code

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

HS Premium Repair: £150-300

Source

Ariston 5 0 2 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