We may have found other answers which could help you.
Click here for Boiler 28 Pressure
E5 Error on Remeha Avanta Plus boiler?
how can i fix my item?
Remeha Avanta Plus not not activating heating?
Remeha avanta boiler 28 - help???
Remeha Avanta plus?
My Remeha Avanta 28C condensing boiler shows an error code?