How much does it cost to fix Remeha error code b22?

Typical repair cost for the Remeha b22 fault is £100-250 including labour.

b22 High

Remeha b22 Fault Code

Q: What does the Remeha b22 fault code mean?

Your boiler has detected that the water temperature sensors are reading back-to-front, which usually means there is a wiring issue or the water is flowing in the wrong direction.

Also written as B22 — same fault.

The Remeha b22 fault code means: your boiler has detected that the water temperature sensors are reading back-to-front, which usually means there is a wiring issue or the water is flowing in the wrong direction.. It appears on 2 Remeha models in our database.

Technical description: Flow and return sensors reversed

Typical repair cost £100-250 (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 b22 fault code

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

Source

Remeha b22 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