How much does it cost to fix Ideal error code 925?

Typical repair cost for the Ideal 925 fault is £150-£350 including labour.

925 High

Ideal 925 Fault Code

Q: What does the Ideal 925 fault code mean?

Your boiler is heating up too quickly and has shut down to prevent overheating, likely because the water isn't moving through the system properly.

The Ideal 925 fault code means: your boiler is heating up too quickly and has shut down to prevent overheating, likely because the water isn't moving through the system properly.. It appears on 2 Ideal models in our database.

Technical description: Maximum temperature - Flow temperature T1 increase too fast

What causes the Ideal 925 fault?

This fault occurs when the water inside the heat exchanger reaches its maximum safe temperature almost immediately after the burner ignites. The most common reason is a blockage or a failed pump preventing water from circulating, which causes the stationary water to boil instantly. It can also be triggered by a faulty sensor sending incorrect temperature readings to the boiler's control board.

This issue often surfaces when the heating is first turned on after summer, as the internal pump can seize up during long periods of inactivity.

Typical repair cost £150-£350 (including labour)

DIY fix possible

Check that all radiator valves are fully openEnsure the boiler pressure is between 1.0 and 1.5 bar on the gaugeCheck if the secondary heating pump is running or if there is a blockage in the external pipework

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Ideal models that show the 925 fault code

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

Source

Ideal 925 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