All the program lights are lit and I am unable to reset Is there any way to determine whether the fault lies with the display pcb or the main control pcb.
It sounds like you’ve managed to get it into a test mode, that’s the only way all the lights should be on.
I *think* pressing the start/stop and program buttons together and holding for three seconds or so should get it back out of it but, it’s not the clearest instructions ever.