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.

Manufacturer manual

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

From this model's manual

Verified against the Ariston Genus 27 Rffi System installation & service manual.

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

Boiler cover options

A cover plan would handle faults like A01: no call-out fees, no surprise bills.

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Lockout fault with a reset-needed pattern.

Older boilers — thermocouple, draught, gas supply.

Safety-critical — turn off, read this.