What does the Vaillant D.69 fault code mean?

Your boiler has failed to light the flame twice in a row, meaning it cannot provide heating or hot water until the issue is resolved.

How much does it cost to fix Vaillant error code D.69?

Typical repair cost for the Vaillant D.69 fault is £120-350 including labour.

Check if other gas appliances, like a cooker, are working to ensure gas is reaching your home.

Unsuccessful ignition for the second time

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

Almost always a stuck diverter valve on combis.

Lockout fault with a reset-needed pattern.

Older boilers — thermocouple, draught, gas supply.