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Vibiemme Domobar - pump roblem
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Discussions > Espresso > Machines > Vibiemme Domobar...  
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Przemek
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Joined: 8 Dec 2012
Posts: 4
Location: Poland
Expertise: Just starting

Posted Sat Dec 8, 2012, 2:00am
Subject: Vibiemme Domobar - pump roblem
 

Hello,
My name is Przemek I'm new to coffeegeek and it is my first post. I'm an espresso lover and have been using Vibiemme domobar (Piccolo) for a couple of years. Unfortunately after moving to new house and installing Vibiemme the machine stopped to work properly.

The problem is this: After turning on the machine the pressure builds as it should and red lamp lights on after the machine is ready to work the red lamp lights off. Every thing looks good, but when I try to make an espresso the pump makes a terrible noise (like never before), the water doesn't flow, the pressure doesn't rice as it should to about 9 bars it stays low at 2 or 3 bars. It looks like the pump is broken, at least that terrible noise from the pump and no pumping water suggest this, but there is also no pressure rise as it was before when I was pouring a shot ' the bar shows the rise of pressure up to 9-10 bars right before the coffee starts to flow.

Because I'm live in a place where the professional service for this kind of machine is not an option I will appreciate very much any help.
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frcn
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frcn
Joined: 23 Dec 2001
Posts: 3,452
Location: Northern California
Expertise: Professional

Espresso: Vibiemme Domobar Double
Grinder: Mazzer Kony, Baratza...
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Roaster: computer controlled Hottop,...
Posted Sat Dec 8, 2012, 5:29am
Subject: Re: Vibiemme Domobar - pump roblem
 

Check the mains voltage on teh circuit when the pump is activated. Try another circuit as well.

 
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Przemek
Senior Member


Joined: 8 Dec 2012
Posts: 4
Location: Poland
Expertise: Just starting

Posted Sat Dec 8, 2012, 7:46am
Subject: Re: Vibiemme Domobar - pump roblem
 

Thank You for reply. I've tried other circuits and one time it worked the pump worked well, but after some time the same thing happened. The pump make a terrible noise, there is no water coming just a steam and the pressure is very low about 2 bars. Could it be that the voltage in my house is causing this ?
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frcn
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frcn
Joined: 23 Dec 2001
Posts: 3,452
Location: Northern California
Expertise: Professional

Espresso: Vibiemme Domobar Double
Grinder: Mazzer Kony, Baratza...
Vac Pot: Hario, 2 Cory pots, 1 Cory...
Drip: Behmor Brazen, Bunn A10 mod...
Roaster: computer controlled Hottop,...
Posted Sat Dec 8, 2012, 8:22am
Subject: Re: Vibiemme Domobar - pump roblem
 

If the machine is not pumping water, the first thing you will want to do is disconnect the heating element before doing any further testing to protecv tthe element from being burned out.
The vibratory pump has a diode in it and that may have failed. It can be tested with an ohmmeter. It should show low resistance in one direction through the windings and very high resistance the other direction. Same with the mains voltage,but it the lights look to be normal brightness, that probably is not the problem. A wildly vibrating and noisy pump likely means that the pump has failed electrically.

 
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SStones
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SStones
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Posted Sat Dec 8, 2012, 12:11pm
Subject: Re: Vibiemme Domobar - pump roblem
 

If the pump noise has changed to an almost metallic "Clacking" my guess is that it's trying to draw a vacuum at the inlet.  The vibrator pump is simply a hollow slug in a solenoid stoppered with a check valve at one end. The pulsing of the coil shakes that slug against it's springs forcing the checkvalve to shove the water forward in one direction while the water forces it open and passes around it while it returns in the opposite direction.  The water provides fluid resistance and limits the clacking noise that such a set-up would make. Check that the inlet hose is not restricted (Possibly at an inline filter?) and/or that the inlet hose is not leaking air into the pump inlet.  If you pull the hose off of the pump inlet, does the water freely run out of it from your reservoir?
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Przemek
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Joined: 8 Dec 2012
Posts: 4
Location: Poland
Expertise: Just starting

Posted Sat Dec 8, 2012, 3:56pm
Subject: Re: Vibiemme Domobar - pump roblem
 

Thank You all,
Could You please explain how to disconnect the heating element and where it is located?
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Przemek
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Joined: 8 Dec 2012
Posts: 4
Location: Poland
Expertise: Just starting

Posted Sun Dec 9, 2012, 7:16am
Subject: Re: Vibiemme Domobar - pump roblem
 

I have tried today another time and I'm observing a certain pattern in malfunction of my Vibiemme:

- Every time I turn on the machine for the first time after a longer pause (several hours) the pressure builds like it should arriving to about 10 bars, the red lamp lights on and turn off when machine is ready to make a coffee.
- When I try to pour the first shot (lever down) the pump starts working as it should normal sound, water is coming but after several seconds there is no water coming and the pressure is falling instead of rising.
- I stop pouring and move the lever up and wait till the pressure fall down till the red lamp lights on and the pressure is building again.
- But this time the pressure build only till 4 bars and stops and the red light turns off
- When I try to pour a shot then there is no water coming and pump make this terrible noise.
- After the second try the pressure build up only up to 3 or even 2 bars and trying to pour a shot gives the same results: no water, terrible sound of the pump

So each try the machine is working perfectly for the first time and after it fails during pouring a first shot the pump is not working and the pressure is not building as it should.

Any ideas ?
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