How much does it cost to fix Ariston error code S 02?

Typical repair cost for the Ariston S 02 fault is £120-350 including labour.

S 02 High

Ariston S 02 Fault Code

Q: What does the Ariston S 02 fault code mean?

Your boiler is struggling to light its flame, meaning it cannot provide heating or hot water until the issue is resolved.

Also written as S02 — same fault.

The Ariston S 02 fault code means: your boiler is struggling to light its flame, meaning it cannot provide heating or hot water until the issue is resolved.. It appears on 5 Ariston models in our database.

Technical description: Flame not detected on second attempt

Typical repair cost £120-350 (including labour)

DIY fix possible

Check that your gas emergency control valve is in the open positionEnsure pre-paid gas meters have sufficient creditVerify if other gas appliances in your home, like a hob, are receiving gasPress the Reset button on the boiler control panel once

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Ariston models that show the S 02 fault code

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

Source

Ariston S 02 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