What does the Ariston 3 04 fault code mean?

Your boiler has been manually reset too many times in a short period, so it has locked itself for safety to prevent damage.

How much does it cost to fix Ariston error code 3 04?

Typical repair cost for the Ariston 3 04 fault is £90-£150 including labour.

Too many (> 5) resets in 15 minutes / Main P.C.B. error

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Lockout fault with a reset-needed pattern.

Safety-critical — turn off, read this.

Break-even maths on monthly cover.