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

Typical repair cost for the Chaffoteaux 10.ii fault is £150-250 including labour.

10.ii High

Chaffoteaux 10.ii Fault Code

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

Your boiler is struggling to maintain a steady temperature and is rapidly turning itself on and off because a internal safety sensor is incorrectly reporting that the system is overheating.

Also written as 10II — same fault.

The Chaffoteaux 10.ii fault code means: your boiler is struggling to maintain a steady temperature and is rapidly turning itself on and off because a internal safety sensor is incorrectly reporting that the system is overheating.. It appears on 3 Chaffoteaux models in our database.

Technical description: Rapid cycling high/low or high/low/off - Limit stat out of calibration

Typical repair cost £150-250 (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.ii fault code

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

Source

Chaffoteaux 10.ii 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