How much does it cost to fix Remeha error code 24.?

Typical repair cost for the Remeha 24. fault is £120-250 including labour.

24. High

Remeha 24. Fault Code

Q: What does the Remeha 24. fault code mean?

Your boiler is confused because it detects that the water flowing out is cooler than the water flowing in, which is the opposite of how it should be working.

Also written as 24 — same fault.

The Remeha 24. fault code means: your boiler is confused because it detects that the water flowing out is cooler than the water flowing in, which is the opposite of how it should be working.. It appears on 3 Remeha models in our database.

Technical description: Temperature sensor fault. a. Flow and return temperature sensors mixed up. b. Flow and return connections mixed up. c. Water flow in D.H.W. mode not correct.

Typical repair cost £120-250 (including labour)

Engineer required

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

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Remeha models that show the 24. fault code

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

Source

Remeha 24. 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