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@Jonny69
Circa 2008 Gaggia Classic. If I leave the steam switched on for a couple of minutes and don't use it, the machine starts rumbling loudly and dumps the steam down one of the silicone pipes into the water container. It then cuts any steam generation for a few minutes until it has cooled down. Any ideas what might have failed? I can see there's a boiler thermostat (107°C?) and a steam thermostat (145°C?) in there. Is there another OPV (other than the one that controls the shot pressure) that might have got furred up or failed?