How much does it cost to fix Chaffoteaux error code E 25?

Typical repair cost for the Chaffoteaux E 25 fault is £120-220 including labour.

E 25 High

Chaffoteaux E 25 Fault Code

Q: What does the Chaffoteaux E 25 fault code mean?

Your boiler is struggling to detect the temperature of your hot water supply because a connection to its internal heat sensor has been lost.

Also written as E25 — same fault.

The Chaffoteaux E 25 fault code means: your boiler is struggling to detect the temperature of your hot water supply because a connection to its internal heat sensor has been lost.. It appears on 1 Chaffoteaux model in our database.

Technical description: Tank sensor open circuit

Typical repair cost £120-220 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Chaffoteaux models that show the E 25 fault code

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

Minima HE Repair: £120-220

Source

Chaffoteaux E 25 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