What does the Vaillant con fault code mean?

Your boiler's internal computer parts are struggling to talk to each other, which means the system cannot receive the signals it needs to turn on.

How much does it cost to fix Vaillant error code con?

Typical repair cost for the Vaillant con fault is £180-450 including labour.

Communication fault with the PCB

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.