What does the Chaffoteaux 12 fault code mean?

Your boiler has lost the correct water pressure needed to run efficiently and will not provide heating or hot water until this is corrected.

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

Typical repair cost for the Chaffoteaux 12 fault is £80-150 including labour.

Locate the external filling loop, usually a small silver braided hose with one or two valves located underneath the boiler.

Loss of pressure shown on gauge - Leak on system or appliance

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

Six most common causes of dropping pressure.

Almost always a stuck diverter valve on combis.

Safety-critical — turn off, read this.