Hi Ok need help here. PCB has been replaced on the boiler in question but it’s now throwing out error code F70. So I know I need to input the DSN in the installer menu by going through option d93 to pair the new PCB to the boiler. Problem is I don’t know how to get to d93. Only installer parameters are showing available, not the service parameters. Can anyone help in the steps to get to the menu of if something has been done incorrectly please advise?