b$# High

Remeha b$# Fault Code

Also written as B — same fault.

The Remeha b$# fault code means: your boiler’s internal computer settings have become scrambled or were adjusted incorrectly, causing the system to stop working for safety.. It appears on 21 Remeha models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: One or several adjusted parameters out of range including some factory defaults which should not have been changed. Check and reset parameters.

What causes the Remeha b$# fault?

This fault occurs when the boiler's internal memory experiences a data error, often caused by a sudden power surge or electrical interference that scrambles its settings. It can also happen if a component has been replaced but not correctly synchronised with the main control board, leading to a conflict in the system's instructions. The boiler shuts down because it no longer trusts its own safety limits and requires a professional to recalibrate the software.

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 b$# fault code

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

Source

Remeha b$# 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