Hey Guys, I just got a brandnew Puristika and am wondering why the pressure with the blindbasket takes 15-18 seconds until it reaches the set pressure of 8 bars. I can adjust the pressure to 12 bars but than it takes even longer to get there. Do you have any idea what component to check? Thanks a lot and have a great weekend. Paul

Does it still take 15 - 18 secs on the second purge ? Could just be the basket filling up, I always fill my blind basket with hot water from the kettle on first purge.

Waitforme Ya its the same for every pull. The third takes just as long as the first. Oh and its the same with coffee in the regular basket - with 4-7red klicks with a C40 Comandante.

Schnullidulli Any chance you can make an unlisted YouTube video and link to it here, so we can see and listen. Welcome to the forum.

DavecUK Sure, there it is: It seems I am not the only one with this issue…

Let me have a think and possibly comission my prototype to check. After which I might ask you to remove case and photograph the pump area.

DavecUK thank you very much Dave 🙏

Schnullidulli while I am thinking can you place a container under the group and lift lever for 10 seconds and weigh output. Also when the blind filter was loaded and it was slowly coming up to pressure was a tube in the water tank returning water most of the time. And does it still happen if the tank lid is loose, with an air gap?

DavecUK I am at work now and dont have access to my machine, but I will do that the Moment I am home. What i can give you is share you another Video I did yesterday to illustrate the waterflow. While pressure is building no water flows or even drops into the watertank until the expansion valve kicks in. Thank you so much for taking the time to troubleshoot my machine 🙏

Schnullidulli - not related to the issue you have, but notice all the squeaking when pulling the lever down. You must, when backflushing with chemicals like Cafiza or Puly, always follow up with lubricating the lever cam.

MediumRoastSteam Ya i noticed that too, but actually never backflusged with any cemicalwls whatsoever until now. Only filtered water. I ordered kamelianoil and flushed back with this yesterday but nothing changed yet. Should and can I just unscrew the lever and smire some oil there or do I have to take the machine appart to properly lubricate it?

ECM Puristika pump very slow

Schnullidulli

DavecUK

Al right. I will do that but probably takes me a few hours tomorrow, because sadly I have to work today again.

Thank you very much for your time again Dave. Very kind of you. 🙏 I will be back with the details as soon as I gathered them.

Schnullidulli

Hey dave. Sorry for the long absence. The shop where I bought the machine exchanged mine for a new one which tool a while. But sadly the Problem remains. It still takes about 15s until the pressure hits 8 bar with the blind basket. If set, it continues until 12 bar but takes of course even longer and climbs slowly but steady.

Every Video i could find from others pulling a shot with their puristika takes about 8s to reach 8-9 bars… now I am a little afraid of telling my poor local dealer that the new machine has the same Problem… :(

DavecUK

I really don’t know, it seems odd to get 2 machines with the same problem.

I can only suggest you do the checks I said… I am baffled, but working blind..

Schnullidulli

Well I opened the case and the first thing that mocks me is hooow many air bubbles are in this tubes and why are there such crazy cheap looking plastic connections between the tubes?

For the Pump the only thing I can read without going further is, that it seems to be an ULKA. A red one as my wife whisly added😅

Schnullidulli

DavecUK

Schnullidulli Standard Ulka EX5 no membrane regulator, so nothing to slow the flow. Try leaving the water tank lid loose and if there is a large filter cartridge, remove it. See if that improves things.

Schnullidulli

do you mean this part?

Schnullidulli

The bubbles inside the tubes dont matter? 😯

I am so sorry for my nooby questions. Never such a high tech machine only the cafelat robot before 🙉

Schnullidulli

I ran another few blind basket tests with the lid of the water Tank open, without the Filter I photographed on the tube which is inside the watertank but still takes 13s to reach 9bars and it seems to me air bubbles rushing through the intake tube while pulling the blind shot…

Here is the little video:

DavecUK

Schnullidulli I meant any big softening cartridge, the small particle filter should be out back. The video is private so i can’t se it, if you can just make it unlisted.

Schnullidulli

Ah sorry, the Video ( should be unlisted now. I thought Private means if you have the link you are still allowed to watch it.

Well a cardridge filter I dont use, I only put already filtered water in the tank.

DavecUK

Schnullidulli unlisted now. I thought Private means if you have the link you are still allowed to watch it.

Unlisted is when only those with the link can watch it.

I would say it’s probably alright, and they may well have used a 0.5mm group jet, which would slow the rise down. Certainly, I wouldn’t be unhappy with that rate of rise for espresso. The long initial delay will be filling the void in the blind filter.

Schnullidulli

But it still takes me 12s to reach 8 bars like almost half my extraction time…

I thought the ulka ex5 should reach full Power in about 5 seconds, no?

MediumRoastSteam

Schnullidulli - to clarify things:

does that rate of rise also happen when you are actually brewing rather than when using the blind filter basket?
could it be that, as Dave is saying, ECM have changed the size of the the jet to 0.5mm, and therefore newer machines are now “slower” to ramp up?

There are a few members with the Puristika here, and would be interesting if they could chime in and share their experience.

Schnullidulli

MediumRoastSteam

It is even worse with coffee in the basket, because it takes more time to saturate the puk until the pressure builds up.

I would love to hear from other puristika users as well.

Schnullidulli

Does anyone has an idea how I can get rid of the air bubbles from the intake? The bubbles appear before they get into this plastic Adapter which you can see in the video…

dsantiago

I’m having the same issue with my brand new puristika. Flow is about 6.4 g/s. From what I searched, these vibration pumps should get something between 7-8 g/s.

I’ve been able to pull good shots with more time tho.

Did you manage to fix this low flow?

Schnullidulli

I couldnt fix it and the replacement machine had the same flaw. I think the pump they buy, is just bad. But I managed to get good espresso as well by pulling longer shots

DavecUK

My Puristika is decommissioned at the moment, I checked my notes, but I didn’t note down the flow rate…I don’t remember it being especially slow. When I next run it, I will check the flow rate. The only caveat, my machine was one of the 3 prototypes built about 2 years before they launched. So it might be different. I believe mine has a standard Ulka pump. It has a green ulka label on the other side and I believe is probably an EX5.

The only possibility is, perhaps they used a 0.5mm gicleur, which might slow things down.

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