Try taking the upholstery nozzle apart, there are only a couple of screws, and make sure the little tube is attached where it is supposed to be attached. Be careful when you take it apart, and remember how to put it back together. Try running some water in the one end and see if it comes out the other end. I had a problem with the grip switch not working, and ended getting Eureka to send me a whole new unit as it was still under warranty. I honestly tried to fix it myself, but I don't think the design is good enough to be fixed, so replacement is usually the better choice. Again, I say, shame on Eureka for such a bad product. A good appliance service depot should be able to get a new hose for you, but if you have to pay big bucks, I think it is better to try a different brand than Eureka. I'm assuming by your question that the nozzle is the one on the upholstery hose attachment.
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Try taking the upholstery nozzle apart, there are only a couple of screws, and make sure the little tube is attached where it is supposed to be attached. Be careful when you take it apart, and remember how to put it back together. Try running some water in the one end and see if it comes out the other end. I had a problem with the grip switch not working, and ended getting Eureka to send me a whole new unit as it was still under warranty. I honestly tried to fix it myself, but I don't think the design is good enough to be fixed, so replacement is usually the better choice. Again, I say, shame on Eureka for such a bad product. A good appliance service depot should be able to get a new hose for you, but if you have to pay big bucks, I think it is better to try a different brand than Eureka. I'm assuming by your question that the nozzle is the one on the upholstery hose attachment.