DeLonghi milk frother not steaming, what usually causes it?

[Thomas Martinez]

Looking up common cause of milk froth machines failing. Found a few online. Seems like three common cause for DeLonghi machines specificaly.
First is a steam leak in the system. If the machine are losing steam, the boiler cannot build up the necessary pressure to create steam.
Second is the steam valve go bad. The steam valve on these machines wear out over time and eventually require a new valve replacement.
Third is the hot water button getting stuck in an on position. When on machines, the button will heat the water to the desired temperature but will not allow steam to exit a wand.
This last one is the most frustrating. It would drive someone crazy to fix this instead of just the steam valve which is a much more easier replacement.

 

[Misty Mandrill]

valve goes first 9 times out of 10 on the magnificas. I've probably swapped 30+ of them. Stuck button is real but rare, usually only see it on machines that live next to a stove getting splattered with grease.

 

[Motionless Mantis]

Wait so when the valve go bad does the machine still pump water out into the drip tray or does nothing happen at all?