Hi, Milos. We're sorry to hear about the spinning issues. This can often be caused by a clog in the system and easily resolved. Try checking the water inlet filter where the garden hose attaches and make sure nothing is clogged. Second, use a small wire (or an inexpensive pressure washer nozzle cleaning tool) and make sure nothing is lodged in the nozzle tips. Also check the center hub for debris that may be impeding the spinning arms. If you're still having trouble with the unit after these steps, please give us a call at 877-362-4271 or email us at productsupport@simpsoncleaning.com and we will be happy to do a little more troubleshooting to identify/resolve the problem. We will include an instructional video below for your convenience!
https://www.youtube.com/watch?v=OL6K18k8QK8&t=5s