Hi all, hoping someone can advise why my Vesuvius has recently started to make a loud hissing noise on warming up. It discharges drips of water and steam into the drip try. I am pretty sure this has recently gotten worse. thanks in advance.

@"BobbyBarista"#p25365 - open the machine up (remove top lid) and find where the steam/hissing is coming from. It will most likely be the anti-vac valve or safety valve. Once identified, please follow up with photos for a better advice on how to proceed.

Hi, thanks for the quick response, here is a pic of where the drips and steam come out, it’s immediately upon heating from cold and only for about 30 seconds. There is no leak at all inside the machine (that I can see anyway). Thanks [URL=https://i.imgur.com/B6lokph.jpg][IMG]https://i.imgur.com/B6lokph.jpg[/IMG][/URL]

That's from the anti vac off the steam boiler isn't it.

Yes,this is normal isn’t it? Mine threw out this much just now from heat up in clean drip tray It does waste a bit of water to be fair, would this be a normal volume? [URL=https://i.imgur.com/xdQsnAt.jpg][IMG]https://i.imgur.com/xdQsnAt.jpg[/IMG][/URL]

That outlet has the vacuum breaker and expansion valve connected to it. It will always weep around 30 ml of water when the machine is started from cold. This is because water expands 4% when heated to brew temp and this is vented from the sealed brew system by the expansion valve. From what's described,vseems normal to me. **How old is the machine, did you purchase it new?**

That’s really helpful thank you all for your help, much appreciated.

> @"BobbyBarista"#p25365 all, hoping someone can advise why my Vesuvius has recently started to make a loud hissing noise on warming up I don’t want to be dismissive here, but… you said the machine has **recently** developed a loud hissing noise on warming up. - The water in the drip tray is a distraction. As confirmed above, it’s normal functionality as explained. Most machines will do that. But… the hissing sound. It must be something you have noticed that changed. if it’s just the anti-vac valve doing its job at warm up - yes, it hisses briefly and water goes to the drip tray, then all good. If it’s hissing for over 30 seconds, or continues hissing, then something else might be at play.

Thanks and thanks for being so thorough. It hisses from that valve, quote a lot at warm up, 30 seconds or so, then stops suddenly. I am pretty sure this is a change, but understood the previous comments to suggest it’s quite normal. Thanks again

Out of interest what water do you feed the machine?

> @"BobbyBarista"#p25399 but understood the previous comments to suggest it’s quite normal. I don't think you mentioned how long before. I asked a question before, imon my phone at the moment, but an answer might be helpful.

Excessive steam release into drip tray on warm up

DavecUK

BobbyBarista Now I’ve got onto the PC, I can honestly say I have never seen a split like that before. I have seen a pipe exposed to over 20 bar and it blew out as you might expect…perhaps there was some small defect in the Pipe.

Elcarajillo

Perhaps it had been ‘pinched’ at some time causing a weak spot ?

Cuprajake

100% that stuff shouldn’t just split

Amberale

It looks like it has been nicked by a sharp blade.
Maybe previously a cable tie was removed and replaced.

DavecUK

Amberale It looks like it has been nicked by a sharp blade.
Maybe previously a cable tie was removed and replaced.

Good call, I was thinking that…it was very much like a knife blade and I know those hoses in truth blow out at a massive pressure, well above 12 bar..I estimated one probably went around 20+ bar. It certainly didn’t look like a pressure blowout.

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