Question about Gaggia Unica Bean To Cup Coffee Machine

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Gaggia unica will not prime

When starting the machine I am requested to prime it. When priming it, only a little water comes out of the steam wand, and it stops after 10 seconds with a red exclamation mark. I therefore turn the steam knob returning me to the original situation where it asks to be primed. After trying to prime 3 times this way, all red signs starts flashing rapidly. I have descaled it with citric acid trying these 3 cycles of water priming for a week, but no help.

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Same problem and I FIX it!
The problem was the flow meter (turbine) which can cause two problems:

  1. like your, poor water from steam.
  2. the machine always ask to prime
The first one is caused by limestone that blocks or partially blocks water entering the flow meter (it has a very small hole)
The second one by limestone that block the flow meter rotor
For both:
  1. Remove the flow meter block (with the whole Black block containing the pipe coming from water tank). You have to lift the black block from the back and pull.
  2. Separate the flow meter from the black block
  3. Disconnect the In and the Out pipes.
  4. When you have the flow meter in your hand (only the white piece), open it turning it's top (clockwise may be)
  5. Using a tooth brush clean well inside parts (top, base, red-rotor)
  6. Using a paper clip clean well both holes (in and out)
  7. Clean the o-ring
  8. When reassembling the flow meter pay attention to the o-ring between the top and the base which must be well fitted into it's seat before close it (if not, some air may come in the water circuit and the pump will not work).
The In and the Out pipes must be at 90 degrees when closed.
Before reconnect pipes, blow with your mouth into the In hole. You should hear the rotor rotating very well.
Hope this help

Posted on Nov 30, 2015

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Gaggia Coffee

Hello, I have been experienceing the same problem since I bought this thing. I used to have the classic Gaggia until it died after 15 years. however, when I went to this one it just didn't function the same.I was having water leaks come from the group assy so I replaced the group valve assy which I saw a diffrence and it functioned properly for a few days, then It was acting up again. No steam to froth and water bypassing the group assy... I then removed the valve assy again and saw it was somewhat clogged of mineral deposits.I cleaned it and after a few days once again it wasn't frothing as it should. Yesterday I completely tore this thing apart but couldn't figure out how to remove the steam valve assy. Does anyone have any ideas?? I removed the 2 screws and it won't move. OH BEFORE I FORGET!!! It was working fine the other day and while I was in the middle of frothing, it suddenly went to half pressure.... ANY IDEAS?? Thank you in advance....

Posted on Sep 17, 2007

EsWorld
  • 1618 Answers

SOURCE: Gaggia Coffee Classic Steam Valve Leaking - No Pressure!!

Yes it can be repaired if you have the parts, you will need the complete steam valve with the o-ring that connects to the boiler check the diagram below.
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Posted on Aug 28, 2009

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