What does the Remeha 2$ fault code mean?

Your boiler is confused because it detects that the water is circulating in the wrong direction or the pipes are connected the wrong way round.

How much does it cost to fix Remeha error code 2$?

Typical repair cost for the Remeha 2$ fault is £150-300 including labour.

Return temp > flow temp: Flow sensor badly installed, Pump operating in wrong direction or flow and return connections crossed

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.

Work through these before the call-out.