What does the Ariston A01 fault code mean?

Your boiler has stopped working because it couldn't light the burner to create heat, most likely due to an issue with its gas supply.

How much does it cost to fix Ariston error code A01?

Typical repair cost for the Ariston A01 fault is £120-350 including labour.

Check if other gas appliances, like a cooker, are working to confirm gas is reaching the property.

Electronic system shutdown because the supply of gas has been cut off (after third attempt to ignite the burner).

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

Lockout fault with a reset-needed pattern.

Older boilers — thermocouple, draught, gas supply.

Safety-critical — turn off, read this.