How much does it cost to fix Remeha error code 25.?

Typical repair cost for the Remeha 25. fault is £120-350 including labour.

25. High

Remeha 25. Fault Code

Q: What does the Remeha 25. fault code mean?

Your boiler has shut down because the water inside it is heating up too quickly, which usually means the water isn't moving through the system properly.

Also written as 25 — same fault.

The Remeha 25. fault code means: your boiler has shut down because the water inside it is heating up too quickly, which usually means the water isn't moving through the system properly.. It appears on 2 Remeha models in our database.

Technical description: Maximum water temperature. Rise in flow temperature too fast. Check: circulation pump, water flow through the unit, and water pressure (0.8 bar min).

Typical repair cost £120-350 (including labour)

DIY fix possible

Check that the water pressure gauge is at least 0.8 bar and top up if necessary using the filling loopEnsure all radiator valves and boiler isolation valves are fully openGently bleed your radiators to remove any trapped air that might be blocking water flow

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Remeha models that show the 25. fault code

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

Source

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

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