Sounds more like the ring clip has come off. Should be easy to replace with a screw driver and pair of pliers.
You'll need to remove the mains cable. Remove the water tank, take out the "bypass" hopper (screws) and remove the bean hopper (screws, make sure you get as many beans out as possible first!) then two more screws at the back hold the hotplate on top. Once you've lifted the hotplate detach the power to the hotplate heater element (put some tape on the wire connector and stick it so it doesn't get lost inside).
Other side of steam knob has a spring clip holding it onto a valve assembly (I had to replace this resin valve with a new one, the new one sent was metal and a lot better constructed).
Here is what I have found to correct the Ventilate issue, go to the front panel and say yes to factory settings.push the hot water button and open and close steam knob until hot water starts flowng,let it drain in the sink and fill the bin 3 or 4 times . this will get out the air bubbles and you will be able to make coffee and steam milk,worked for me.
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if the steamer is not been in use for a ling time is possible tha the valve got stuck. You can try to open and close the steam handle repeating that very often while steam get out. if it does not work try to make a cicle of water mixed with salt, just start the coffe maker, warm up and start WITHOUT COFFEE, you repeat that several time to obtain clean water from the fiter, warm up for steam function and start to open-close the steam handle on the right of the coffee maker body. If that doese not helps you must change or repair the rubinet-valve of steamer, apply to assistence.
First you should remove the end tip of the steam hose and try to clean the steam holes with a pin. The steam should come frealy withou the end tip. If not then you shoul desasemble the steam tap , clean it and put it back together. The problem is only caused by dry milk or milk with chocolate. Even if you manage to have some steam then the problem can be solve by using the steamer warming just water in a glass and leave it all nigh long inside the boiling water in glass this will meld the dirt and will gos away.
Steamer tubes can get plugged up with dried milk and/or calified water deposits in the tube. With the machine unplugged, turn the tube up to check it, Clean it with a small guage wire. Soak it in a small cup of vinegar, if needed. Further cleaning, you can add a bit of vinegar to the water and steam it thru... Let me know how it goes. K
Check the end/nozzle of the steam wand, if you open the wand and while getting nothing it is hot, then the nozzle is blocked use a paperclip to clear the hole at the end of tip. If you have done this already and still no steam then it is clogged where the steam valve connects to the boiler.
Try using the milk clamp on the tube going into the milk.Tightening it will make your milk hotter.
Your steam wand however, is a different problem.
First, check in the programming that the steam temp. is 125 celcius.
If it is, and none of the tubes from the steam wand to the boiler valve are blocked, your boiler temp. sensor may be faulty, in which case, you will need to replace that.
a. Possible air in the system. Switch to hot water iso steam, let warm water pas for a minute by turning the knob fully open. Stop tapping warm water (close the knob) and switch the machine to steam iso water. Try to get the steam by fully opening the knob (pump should start running).
b. Solidified milk in the system blocking internal tubes. To avoid this always purge the system (shortly open the steam to an empty cup or a towel) after you steamed milk to avoid milk being sucked back into the system due to condensation of steam (this creates a vacuum and reverse flow). To resolve the blocked tubing: clean the nozzle and try flushing the system (tapping warm water).
We just had the very same issue and I went back to the product directions--we took things apart and thoroughly cleaned everything, especially each part of the sleeve. Once we put it back together we sat it next to the sink and ran it on steam with the water/steam going into the sink until it was running cleanly with a good steady flow. Fixed!! I'm so pleased because we love this machine...I'm totally addicted! Good luck.
When you turn on the steam switch, does the steam light turn on, then eventually turn off when it comes up to temp?
If so, your wand may be plugged with a dried plug. I have resolved this by pouring boiling water into my steaming pitcher and soaking the wand for several minutes, then fire up the machine and heat for steam, then blast it out.
Might take a few tries. You may also need to run a thin wire, like a guitar string, up the wand to help free up the plug.
Try opening the frothing valve by turning the dial and force water through it instead of steam by pressing the middle, coffee button. You may be experiencing vapor lock. Once the water comes through the steamer valve, turn the steamer knob off and release the coffee button. Then try the steamer button with the steamer dial open. This may do the trick.