How much does it cost to fix Chaffoteaux error code E 12?

Typical repair cost for the Chaffoteaux E 12 fault is £150-250 including labour.

E 12 High

Chaffoteaux E 12 Fault Code

Q: What does the Chaffoteaux E 12 fault code mean?

Your boiler is unable to read the water flow correctly because of an electrical fault with an internal sensor, which means it has shut itself down to prevent any damage.

Also written as E12 — same fault.

The Chaffoteaux E 12 fault code means: your boiler is unable to read the water flow correctly because of an electrical fault with an internal sensor, which means it has shut itself down to prevent any damage.. It appears on 2 Chaffoteaux models in our database.

Technical description: Flow sensor short circuit

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 E 12 fault code

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

Source

Chaffoteaux E 12 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