How much does it cost to fix Ariston error code S 01?

Typical repair cost for the Ariston S 01 fault is £100-250 including labour.

S 01 High

Ariston S 01 Fault Code

Q: What does the Ariston S 01 fault code mean?

Your boiler tried to light the burner but couldn't detect a flame, so it is currently not providing heating or hot water.

Also written as S01 — same fault.

The Ariston S 01 fault code means: your boiler tried to light the burner but couldn't detect a flame, so it is currently not providing heating or hot water.. It appears on 5 Ariston models in our database.

Technical description: Flame not detected on first attempt

Typical repair cost £100-250 (including labour)

DIY fix possible

Check if other gas appliances, like a hob, are working to ensure gas supply is activeCheck for any credit on your prepaid gas meterTurn the boiler off and on again to trigger a reset

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Ariston models that show the S 01 fault code

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

Source

Ariston S 01 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