How much does it cost to fix Chaffoteaux error code 10.i?

Typical repair cost for the Chaffoteaux 10.i fault is £120-250 including labour.

10.i Medium

Chaffoteaux 10.i Fault Code

Q: What does the Chaffoteaux 10.i fault code mean?

Your boiler is struggling to keep the water flowing at a steady rate, causing it to constantly turn on and off as it fails to regulate the temperature properly.

Also written as 10I — same fault.

The Chaffoteaux 10.i fault code means: your boiler is struggling to keep the water flowing at a steady rate, causing it to constantly turn on and off as it fails to regulate the temperature properly.. It appears on 3 Chaffoteaux models in our database.

Technical description: Rapid cycling high/low or high/low/off - Low water flow rate

Typical repair cost £120-250 (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 10.i fault code

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

Source

Chaffoteaux 10.i 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