How much does it cost to fix Chaffoteaux error code 05?

Typical repair cost for the Chaffoteaux 05 fault is £0-80 including labour.

05 Low

Chaffoteaux 05 Fault Code

Q: What does the Chaffoteaux 05 fault code mean?

Your boiler has detected that the internal water temperature is very low and has automatically turned on the pump to prevent the pipes from freezing.

The Chaffoteaux 05 fault code means: your boiler has detected that the internal water temperature is very low and has automatically turned on the pump to prevent the pipes from freezing.. It appears on 7 Chaffoteaux models in our database.

Technical description: Anti freezing system, pump on

Typical repair cost £0-80 (including labour)

DIY fix possible

Ensure the boiler power supply remains switched onCheck that the gas supply is activeIncrease the room thermostat temperature slightly to encourage the boiler to fire upCheck that any external condensate pipes are not frozen or blocked

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Chaffoteaux models that show the 05 fault code

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

Source

Chaffoteaux 05 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