Use Citric Acid.
SOURCE: leaking steam valve rancilio miss audrey
you should take out the knob first, than you try to disasembke the SHAFT of valve from the valve body, in this types(small espresso coffe machines) usualy producer use conical valve, without seals she close metal to metal, when you get out the SHAFT you will see one line on the conical end. for repairing it will be enough to visit one metal vorkery where they will take a small amount of brass from end and polish it. then you put it back and work again with your machine.
ps: notice you only polish the SHAFT , dont let them to short the more than 0.5 mm
SOURCE: where is the reset button on the rancilio audrey?
Once you get the top off, there are 2 thermostats on the top of the boiler. Your looking for the thermostat that is on the front of the boiler with the red button . Push the red button. If that didn't work check the ohms reading on the element. It should read 12 - 16 ohms. If it doesn't replace the element. Also did you try to turn on the steam button? Sometimes the thermostat with the red dot on it goes bad. If it will steam just replace the brew thermostat.
SOURCE: My Rancilio Silvia developed a terrible burning
Sounds like the machine needs to be descaled and the boiler and element needs to be checked.
Was the machine left on for a long time?
If yes then the element needs to be replaced.
SOURCE: Without changing the coffee (use Illy) and without
Backwash group with purocaff and remove screen and clean.
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