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I have the above boiler which was working fine. I switched it off at the mains to clean the magnaflow. When I switched back on the blue light is flashing. Reset does not clear it. Any adeas or advice?

Hi, I have this system and was working fine until I press a wrong button in the engineers program my fault entirely. It's still works 90% but I need to reinstall. Do I have to do an engineers reset? Do the pirs reset on their own? Thanks for taking the time