What does the Vaillant F.29 fault code mean?

Your boiler was working but the flame has gone out unexpectedly, meaning the system cannot heat your home or water.

How much does it cost to fix Vaillant error code F.29?

Typical repair cost for the Vaillant F.29 fault is £100-350 including labour.

Check if other gas appliances in your home, like a hob, are working to confirm gas supply.

Flame extinguished

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.

Safety-critical — turn off, read this.