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

Typical repair cost for the Ideal E 25 fault is £150-300 including labour.

E 25 High

Ideal E 25 Fault Code

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

Your boiler is shutting down because it detects the water is heating up far too quickly, which usually suggests it is struggling to move that heat around your home.

Also written as E25 — same fault.

The Ideal E 25 fault code means: your boiler is shutting down because it detects the water is heating up far too quickly, which usually suggests it is struggling to move that heat around your home.. It appears on 1 Ideal model in our database.

Technical description: Flow temperature rise too fast

Typical repair cost £150-300 (including labour)

Engineer required

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

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Ideal models that show the E 25 fault code

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

Imax W Repair: £150-300

Source

Ideal E 25 fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.

Ideal Imax W manual (PDF)

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026