Jura Impressa x7 . If I press the cappuchino, steam or froth milk buttons ,the coffee machine makes two beeps.It looks like the steam function is disabled.

SOURCE: No milk,or steam coming from cappucinno nozzle

If you pull the cappacino component off. The black plastic thing at the end of the metal tube (where the cappacino component's attached to) can be unscrewed by rotating it with your hand. You can clean it with a brush and a thick needle to clean the hole the make sure that it's not blocked. After that just screw it back on and reattach the cappacino component.

SOURCE: No steam on Capresso Impressa S8

Most likely problem is over temp cut out switch. Small diode attached to the boiler to prevent damage during boil dry, or fault in the heating element itself. Difficult machines to repair and best handled by a service technician.

SOURCE: Jura Capresso Impressa S9- no steam

I had a similar problem. I took off the side and rear cover, followed the hose that comes from the steam wand to the rear of hte unit. It enters a solenoid made by ACL Italy. I dismantled the solenoid unit by disconnecting the two hose ends, removing the relay, and unscrewing the plunger unit (vertical pipe). The plunger unit internals should move freely up and down like a piston in a cylinder , powered by a small spring. In my unit, this plunger was calcified and seized. I soaked it in boiling water and pressed on it gently several times and it unstuck. I put it all back together again and presto! Good luck

SOURCE: Hi, our Jura Impressa Xs90

Have you run a decal recently? This normally happens when a small particle (normally) an undesolved piece of the decal tablet is stuck in the flow meter, or sensor.
You can try and run warm water through the system and after about half a tank it should be sorted out.