How much does it cost to fix Ariston error code E25?

Typical repair cost for the Ariston E25 fault is £120-200 including labour.

E25 High

Ariston E25 Fault Code

Q: What does the Ariston E25 fault code mean?

Your boiler is struggling to accurately measure the temperature of the water being stored or prepared, which is preventing it from heating your home or taps correctly.

The Ariston E25 fault code means: your boiler is struggling to accurately measure the temperature of the water being stored or prepared, which is preventing it from heating your home or taps correctly.. It appears on 2 Ariston models in our database.

Technical description: Tank sensor open circuit

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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Ariston models that show the E25 fault code

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

Bravo 24 MFFI Repair: £120-200
Egis 24 MFFI Repair: £90-180

Source

Ariston E25 fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026