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 temperatures inside are very low and is running its pump to prevent the internal water from freezing.. It appears on 1 Chaffoteaux model 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 freezing system, pump on

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 7 July 2026