We may have found other answers which could help you.
Click here for Boiler 28 Pressure
pressure gauge fault?
Remeha Avanta Plus 28c no hot water but still have heating?
Remeha avanta boiler 28 - help???
E5 Error on Remeha Avanta Plus boiler?
I have a Remeha boiler - there is no error message but the rads dont work?
Remeha Avanta Plus not not activating heating?