The RGI who will service the boiler after the diy pcb change wont be looking for original parameters for the safety components and will just do the basics and he will get paid and leave. He should be told that pcb has been changed.Cool, so replace the faulty pcb, get it working.
Then get it serviced - all safe and happy.
Why not, the gas rate may be ok and who gives a monkee about the fan speed or the kids asleep in their bed not going to school tomorrow.
Thank you - we are getting somewhere now. So there are variables to be set on the PCB, which an RGI will need to adjust. This can be done when it is serviced, I just need to let him know.