How much does it cost to fix Chaffoteaux error code 8.13?

Typical repair cost for the Chaffoteaux 8.13 fault is £120-£450 including labour.

8.13 High

Chaffoteaux 8.13 Fault Code

Q: What does the Chaffoteaux 8.13 fault code mean?

Your boiler is making a loud knocking or vibrating noise because the water isn't flowing through the main heat exchanger correctly, causing it to overheat locally.

Also written as 813 — same fault.

The Chaffoteaux 8.13 fault code means: your boiler is making a loud knocking or vibrating noise because the water isn't flowing through the main heat exchanger correctly, causing it to overheat locally.. It appears on 3 Chaffoteaux models in our database.

Technical description: Heating Body Noise

Typical repair cost £120-£450 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Chaffoteaux models that show the 8.13 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Chaffoteaux 8.13 fault code information on this page is sourced and cross-checked against the official Chaffoteaux service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026