What does the Vaillant d.65 fault code mean?

Your boiler is taking longer than it should to light the flame, which is preventing the heating from starting up properly.

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

Typical repair cost for the Vaillant d.65 fault is £120-280 including labour.

Check that your gas emergency control valve is in the 'on' position

Maximum burner ignition 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.

Lockout fault with a reset-needed pattern.

Older boilers — thermocouple, draught, gas supply.

7 signs repair isn't worth it anymore.