What does the Chaffoteaux 9.iii fault code mean?

Your boiler is overheating because it is burning too much gas, which has caused it to stop working to avoid potential damage.

How much does it cost to fix Chaffoteaux error code 9.iii?

Typical repair cost for the Chaffoteaux 9.iii fault is £120-250 including labour.

Excessive temperature rise across boiler - Gas rate too high

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.