What does the Remeha b25 fault code mean?

Your boiler is heating up too quickly, which usually means the water is trapped or not moving through the system properly.

How much does it cost to fix Remeha error code b25?

Typical repair cost for the Remeha b25 fault is £150-350 including labour.

Check that all radiator valves are fully open

Temperature rise too fast (dT/dt)

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Each noise points to a different fault.

Sludge build-up — needs flushing, not bleeding.

7 signs repair isn't worth it anymore.