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I have a Duoclear 25 for 3 years now. The unit has been nothing but trouble. I too have a low salt light even when the pool is tested at 4500ppm. 4500ppm for our taste is too high. The main board has been replaced for erroneous errors and now one year later the salt cell generator is non functional. The quality is poor. Furthermore most pool stores don't even know how the nature 2 works and alwasy recommend chemicals that are harmful. The company Clearwater has poor customer service.
I have the zodiac duoclear system and have used it for nearly two years. All in all, it's a very good system. I have had similiar issues on occassion. Have you tried the master reset button on the lower right hand face of the control board? I've been able to clear up the lights by resetting the system.
If the salt content in the pool is not correct, the system will not allow you to superchlorinate. Your salt level should be at 4000 ppm. The add salt light is programmed to come on if the system gets below 3600 ppm. When the system is below 4000 ppm, it is unable to generate the chlorine needed. The lower the salt, the less you can chlorinate. Might not be your problem, but I've run into this before too.
The lights for replacing your cartridge puzzle me. I'm making an assumption that your pool is probably dirty if you're trying to superchlorinate. The dirtier the water, the faster the electrode in the cartridge will get covered in scale from the current and conversion process. Try cleaning the new cartridge by placing it in a bucket with a 75% water and 25% muratic acid mix. Let it soak for a few minutes and gently swirl it around in the mixture. This will clean the contacts in the cartridge.
Keys with the Duoclear system: Salt content and clean the filters regularly. Don't know if this will solve your problem or not, but good luck.