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.

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.

Check that your gas emergency control valve is in the open position

Flame not detected on second attempt

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Almost always a stuck diverter valve on combis.

Lockout fault with a reset-needed pattern.

Older boilers — thermocouple, draught, gas supply.