What does the Ariston E 20 fault code mean?

Your boiler is mistakenly detecting a flame when it shouldn't be, which is a safety mechanism preventing it from starting up normally.

How much does it cost to fix Ariston error code E 20?

Typical repair cost for the Ariston E 20 fault is £150-300 including labour.

False flame detection with gas valve closed

This is a emergency 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.