What does the Chaffoteaux 6 09 fault code mean?

Your boiler has detected that the exhaust gases leaving the unit are becoming dangerously hot, so it has shut itself down to prevent damage or fire.

How much does it cost to fix Chaffoteaux error code 6 09?

Typical repair cost for the Chaffoteaux 6 09 fault is £150-350 including labour.

Manufacturer manual

Surchauffe fumée

From this model's manual

Verified against the Chaffoteaux Talia Green System installation & service manual, page 39.

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

Boiler cover options

A cover plan would handle faults like 6 09: no call-out fees, no surprise bills.

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Each noise points to a different fault.

Work through these before the call-out.

Sludge build-up — needs flushing, not bleeding.