What does the Chaffoteaux YELLOW FLAMES fault code mean?

Your boiler is burning gas inefficiently, which is dangerous and can lead to the production of poisonous carbon monoxide gas.

How much does it cost to fix Chaffoteaux error code YELLOW FLAMES?

Typical repair cost for the Chaffoteaux YELLOW FLAMES fault is £150-350 including labour.

i) Heating body fms blocked

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

Each noise points to a different fault.

Sludge build-up — needs flushing, not bleeding.

Safety-critical — turn off, read this.