What does the Vaillant F.65 fault code mean?

Your boiler’s internal control board has become too hot and has shut down as a safety precaution to prevent damage.

How much does it cost to fix Vaillant error code F.65?

Typical repair cost for the Vaillant F.65 fault is £180-350 including labour.

Turn the boiler off using the main power switch.

Electronic system temperature too high

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

Safety-critical — turn off, read this.

7 signs repair isn't worth it anymore.

Break-even maths on monthly cover.