What does the Chaffoteaux E 12 fault code mean?

Your boiler is unable to read the water flow correctly because it has detected an electrical connection error with one of its internal sensors.

How much does it cost to fix Chaffoteaux error code E 12?

Typical repair cost for the Chaffoteaux E 12 fault is £120-220 including labour.

Flow sensor short circuit

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.

Safety-critical — turn off, read this.

7 signs repair isn't worth it anymore.