E 05 Low

Chaffoteaux E 05 Fault Code

Also written as E05 — same fault.

The Chaffoteaux E 05 fault code means: your boiler has detected that the water temperature is very low and has automatically switched on its internal pump to circulate water and prevent the pipes from freezing.. It appears on 3 Chaffoteaux models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Anti-freeze system, pump only

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 E 05 fault code

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

Source

Chaffoteaux E 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 31 August 2026