Just bought new power head electrolux guardian and

Did you get new wands with the power nozzel? The wires that power the nozzel run through the wands from the hose to the nozzel.The connectors at the end of the wires are fomous for getting too big and making a bad connection. This causes the on/off problem. This will only get worse if you continued use. The wires in the hose handle, the hose and the power nozzel elbow can all be changed out. You will not have to replace the hose handle or the wands unless the plactic has been burned. (A loose electrical connection causes heat). Take your hose,wands and nozzel to the shop for repair. Don't let the sales/service manager tell you that you need new parts until you can see the parts are bad. I think they saw you comming when they sold you the new nozzel.(just my opinion)