What does the Remeha E9 fault code mean?

Your boiler is struggling to move water around your heating system properly, which is causing it to shut down for safety.

How much does it cost to fix Remeha error code E9?

Typical repair cost for the Remeha E9 fault is £120-250 including labour.

Water flow problem: Flow and return temperature sensors swapped or insufficient flow (delta T too high)

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

Almost always a stuck diverter valve on combis.

Each noise points to a different fault.

Sludge build-up — needs flushing, not bleeding.