I have an electrolux central vacuum in my house. My central vac hose has something stuck in it, I think, maybe a sock. I tried to put a long dryer wand down it but the hose is just too long. Does this need a repair man or new hose?? Any idea of a way to blow it out? Thanks.

The best way to clear an obstruction is to blow it out by attaching the wall end to the exhaust of a shop vacuum, or using an air compressor.
You can try holding the wand end of the hose directly to the CV in port and turning the machine on. This provides essentially the same action as the previous method.
If neither of these work, try a combination of the two. Or using a shop vac, hold the wall end to the exhaust of the vacuum and the wand end to the in port of the shop vac. Turn shop vac on and the obstruction should come out.
Borrow a good strong shop vacuum if you need to.
If these methods fail, take it to an authorized Aerus Electrolux store and have the service tech try to clear it. Care must always be taken when trying to clear an obstuction with a long object, especially if it's pointed. I've seen many hoses that have shorted out and even caught fire due to the wiring accidentally being "nicked".