E 16 Low

Chaffoteaux E 16 Fault Code

Also written as E16 — same fault.

The Chaffoteaux E 16 fault code means: your boiler is having trouble communicating with the external weather sensor on the outside of your property, causing it to lose track of the outdoor temperature.. 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: Outdoor sensor short circuit (where fitted)
Typical repair cost £120-200 (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 16 fault code

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

Source

Chaffoteaux E 16 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