Electrical Questions? Ask an Electrician Online.
hi this is John and will try and help you..........during cranking if the board does not see a valid rpm signal within 3 seconds it will shut down and send a RPM Sensor Loss display........a common cause of rpm sensor loss fault is the lack of engine cranking which could be caused by a faulty crank circuit or a faulty starter
normally a generac tech would have to run specific diagnostic tests to determine exact cause of fault. any other testing done could cause harm to unit......I would suggest to contact generac for a tech near you to service.