How much does it cost to fix Remeha error code 30.?

Typical repair cost for the Remeha 30. fault is £150-300 including labour.

30. High

Remeha 30. Fault Code

Q: What does the Remeha 30. fault code mean?

Your boiler has switched itself off because the water inside is not circulating correctly, causing a significant temperature difference between the water heading to your radiators and the water returning to the boiler.

Also written as 30 — same fault.

The Remeha 30. fault code means: your boiler has switched itself off because the water inside is not circulating correctly, causing a significant temperature difference between the water heading to your radiators and the water returning to the boiler.. It appears on 2 Remeha models in our database.

Technical description: Max. water temp. Difference between flow and return temperature too high.

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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Remeha models that show the 30. fault code

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

Source

Remeha 30. 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