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

Typical repair cost for the Chaffoteaux 09 fault is £120-200 including labour.

09 High

Chaffoteaux 09 Fault Code

Q: What does the Chaffoteaux 09 fault code mean?

Your boiler has lost the ability to measure the temperature of your hot water, which means it will stop providing hot water until the faulty sensor is replaced.

The Chaffoteaux 09 fault code means: your boiler has lost the ability to measure the temperature of your hot water, which means it will stop providing hot water until the faulty sensor is replaced.. It appears on 6 Chaffoteaux models in our database.

Technical description: Domestic Hot Water thermistor faulty (open circuit)

Typical repair cost £120-200 (including labour)

Engineer required

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

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Chaffoteaux models that show the 09 fault code

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

Source

Chaffoteaux 09 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