How much does it cost to fix Ideal error code 025?

Typical repair cost for the Ideal 025 fault is £150-300 including labour.

025 High

Ideal 025 Fault Code

Q: What does the Ideal 025 fault code mean?

Your boiler is shutting down because it detects the water is heating up too rapidly for the system to safely handle.

The Ideal 025 fault code means: your boiler is shutting down because it detects the water is heating up too rapidly for the system to safely handle.. It appears on 1 Ideal model in our database.

Technical description: Flow temperature T1 increase 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 025 fault code

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

Maximiser SE Repair: £150-300

Source

Ideal 025 fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.

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