What does the Ariston E 99 fault code mean?

Your boiler has failed to start multiple times and has automatically locked itself for safety to prevent a gas buildup.

How much does it cost to fix Ariston error code E 99?

Typical repair cost for the Ariston E 99 fault is £150-300 including labour.

After the fifth attempt, the boiler goes into safety shutdown mode

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.

7 signs repair isn't worth it anymore.