HELP problem with Rocket Apparatamento

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TV33

#1: Post by TV33 »

Hello,
my Rocket Appartamento (which I love very much) gives me some problems.
You will see this in the 2 videos below and I am looking forward to your help.
I dropped the machine off for the first time to my dealer who told me that even when using Volvic (water) there can be small crystals that can be a problem. So he did what he had to do to clean it (a little more than 50 euros) but shortly after I got the machine back, the problem came back. So I dropped the machine off again and the after-sales service didn't notice anything (he sent me a video to prove it). I retrieve the machine and it works for a while, I even send an email saying that it works and therefore, strange ... but here it goes again.
Thank you for your suggestion, help, etc.
The second video sounds like a "yoyo".
Obviously the grinder is well adjusted and I use a proven coffee.

walterP

#2: Post by walterP »

Is the green light flashing?
I had similar problems when I switched to purified water. The Rocket needs some mineral content to "see" that the tank is not empty.
frustrating to say the least. Use good water but not too good I guess...

nahau

#3: Post by nahau »

The pull looks like the machine is choking. You say the grinder is adjusted correctly, but have you tried grinding coarser to see what happens?

The pump sounds bad in the second video. It could be the pump itself or blockage in the grouphead or elsewhere. Could also be a bad OPV valve releasing pressure too soon. Have you pulled apart the grouphead to inspect the gicleur valve (and screen) to make sure it's not plugged with scale?

Unfortunately, your machine doesn't have a brew pressure gauge from what I read about it. Such a gauge would make troubleshooting much easier, and also maintenance and adjustment of the brew pressure. After you fix this problem, you might consider installing a brew pressure gauge if you're going to keep the machine.

TV33

#4: Post by TV33 »

hi, thank you,
nahau wrote:Could also be a bad OPV valve releasing pressure too soon. Have you pulled apart the grouphead to inspect the gicleur valve (and screen) to make sure it's not plugged with scale?
Yes the repairman did. He cleaned everything at this level.
nahau wrote:After you fix this problem, you might consider installing a brew pressure gauge if you're going to keep the machine.
The repairman also, he tells me, checked the pressure which would be good but it must be said that when the Rocket was at home he didn't encounter any problems.
nahau wrote:You say the grinder is adjusted correctly, but have you tried grinding coarser to see what happens??
yes the grinder is well adjusted, I have 2 espresso machines at home (Lelit equivalent for the second one).

Here is another video I made this morning with the backflush basket. You can hear it choking and at the end there is little water flowing through the backflush valve.
(sorry for my average English)

User avatar
BaristaBoy E61

#5: Post by BaristaBoy E61 »

Might the problem be related to a defective vacuum breaker?
"You didn't buy an Espresso Machine - You bought a Chemistry Set!"

nahau

#6: Post by nahau »

TV33 wrote:yes the grinder is well adjusted, I have 2 espresso machines at home (Lelit equivalent for the second one).
Grind settings for one machine may not work for a different machine.

The pump sounds normal in the blind basket video where the pump quiets down after a while. However, it seems to me that the pump quiets down too quickly. It should take some time for the basket to get filled with water before pressure can build to quiet the pump. There also doesn't seem to have that much pressure being released when you lower the lever. A machine pushing 10 bar will create a "whoosh" when all that pressure is being released. It's looking more like a pump problem, (or still possible blockage) but see the next paragraph.

There was a thread a little while ago where the OP was having similar pump problems. What he eventually found out was that the outlet the machine was plugged into wasn't delivering enough power. If the outlet your machine is plugged into is also not delivering enough poower, then it could be affecting the machine. It might explain why the machine works at the repair shop and not in your home. You might try plugging the machine into another outlet to see what happens. It's a long shot but worth trying just to make sure it's not something weird like that.
BaristaBoy E61 wrote:Might the problem be related to a defective vacuum breaker?
Are you referring to the vacuum breaker on the boiler? How would that mess with the HX?

TV33

#7: Post by TV33 »

"Grind settings for one machine may not work for a different machine."
yes I know that, I have owned the machines for 2 years and I know the difference to wear on the grinder. I am absolutely certain that the grind is correct. What's more, I use coffees that I know.

"It's looking more like a pump problem, (or still possible blockage) but see the next paragraph."
Thank you

"outlet"
It's the same outlet from the beginning. And there are still the same number of devices that have been plugged into this outlet for more than two years. This being said, I will try to plug the device into another outlet or unplug the 2 other devices (which never work at the same time as the Rocket)

Thank you for your help.

TV33

#8: Post by TV33 »

hello,

I followed the advice of the after-sales technician who suggested I put a needle in the injector. It seems to work. If it happens again, he also suggests pouring some descaler on the injector.

the thread in the needle is a safety feature in case it escapes from the hand and falls into the injector.

No more problems this morning, but it's a case to follow and something to know for E61 group owners.






JRising

#9: Post by JRising »

Okay, cleaning the gigleur with a needle has improved the flow to the point where you don't notice that the pump is stalling...
But why was the pump stalling? The OPV should open to full flow long before 11 bar, and a EAX5 pump should be able to move well over 40ml/30 seconds against that much back-pressure. The pump shouldn't be forced to a physical stop.

I suggest you test it against some portafilter with a pressure gauge if you can easily get your hands on one, or at least see if there's any flow at all coming over the OPV when brewing against a back-flush disk... If there is some flow over the OPV, then you can descale the OPV without removing it from the machine, and maybe free it up. (If you think it needs it, and now we're back to the point where we want a gauge and want to see at what pressure it's stalling the pump)...