I have an ICS-1000, but it's broken. The monitor cannot be lighted. Can I buy an ICS-2000 to detect the original sensor? Is ICS-2000 compatible with ICS-1000?

There is no migration, but the ICS-2000 can learn the existing signal. The only thing you need to do is add it via the app and start listening and then make sure the sensor is sending a signal.