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La Pavoni Pub V
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Discussions > Espresso > Machines > La Pavoni Pub V  
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mlewis42
Senior Member
mlewis42
Joined: 24 Mar 2013
Posts: 5
Location: Ann Arbor Michigan
Expertise: I love coffee

Posted Sun Mar 24, 2013, 6:14pm
Subject: La Pavoni Pub V
 

Does anyone have any experience with these machines? Mine is a ca. 1989. I bought it about 7 years ago in an almost brand new condition. We make 3-4 cappucinos a day, so very light use.

I think there is a faulty pump. It has a pump I installed below the counter to fill it, but I'm talking about a pump that pushes the water through the grounds. It seems like a weak flow and the coffee is really bitter.

It also seems to be making strange noise when the pump kicks on. An extra whirring sound.
thanks in advance
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ProtoTech
Senior Member
ProtoTech
Joined: 25 Mar 2013
Posts: 6
Location: New York City, NY
Expertise: Professional

Posted Mon Mar 25, 2013, 7:58pm
Subject: Re: La Pavoni Pub V
 

From what your describing, it sounds like the water pump is being deprived of water.  Does the machine have a single or dual pressure guage?  If it's a dual, check the pump pressure needle and see if it moves to on or around 8. If not, your problem could be in your pump system that delivers the water to the unit.  As for the bitter taste of the espresso, a new group screen and gasket would help. Also depends on the grind of he coffee, etc etc. Lets take it 1 step at a time though.  Good Luck.
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mlewis42
Senior Member
mlewis42
Joined: 24 Mar 2013
Posts: 5
Location: Ann Arbor Michigan
Expertise: I love coffee

Posted Sun Apr 14, 2013, 6:53am
Subject: Re: La Pavoni Pub V
 

Thanks for the response! I think it has dual pressure, one shows pressure that can be adjusted with the pressure switch, and one shows the pressure when pulling a shot. I disconnected the line from the external pump to the machine and turned it on just to see if it was working. It did up the pressure of the water coming thru the line, but not as much as I expected. I reconnected the hose and tried to pull a shot. The machine has been off for several weeks. Now it makes a horrible screeching sound when you try to cycle it. I'm wondering if one of the solenoids has failed and not allowing water to flow thru the machine? I'll upload some pictures of the unit
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mlewis42
Senior Member
mlewis42
Joined: 24 Mar 2013
Posts: 5
Location: Ann Arbor Michigan
Expertise: I love coffee

Posted Sun Apr 14, 2013, 7:27am
Subject: Re: La Pavoni Pub V
 

Some pictures of my machine

mlewis42: IMAG1573 (1).jpg
(Click for larger image)
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mlewis42
Senior Member
mlewis42
Joined: 24 Mar 2013
Posts: 5
Location: Ann Arbor Michigan
Expertise: I love coffee

Posted Sun Apr 14, 2013, 7:29am
Subject: Re: La Pavoni Pub V
 

Data plate

mlewis42: IMAG1572 (1).jpg
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mlewis42
Senior Member
mlewis42
Joined: 24 Mar 2013
Posts: 5
Location: Ann Arbor Michigan
Expertise: I love coffee

Posted Sun Apr 14, 2013, 7:31am
Subject: Re: La Pavoni Pub V
 

Pressure guage

mlewis42: IMAG1582_1.jpg
(Click for larger image)
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Bluedogbrewery
Senior Member


Joined: 16 Feb 2013
Posts: 4
Location: Portland, OR
Expertise: I like coffee

Posted Fri May 24, 2013, 2:24pm
Subject: Re: La Pavoni Pub V
 

I just bought one of these things.

You might try changing out the group head screen before you do anything more costly.  The screen comes in two types - one with a hole in the middle that can accommodate a screw and another that is a press fit (See link below - part F.228).  

http://www.espressoparts.com/p1p3solenoidgroup

Good luck!
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stefano65
Senior Member
stefano65
Joined: 30 Oct 2004
Posts: 1,415
Location: Eugene OR
Expertise: Professional

Espresso: Vibiemme,Elektra,
Grinder: Vario,Macap,
Vac Pot: not
Drip: not
Roaster: not
Posted Fri May 24, 2013, 2:38pm
Subject: Re: La Pavoni Pub V
 

Few points:
remove the showerscreen for inspection as mention above,
remove the gigluer filter screen for inspection (descale if necessary) and make sure the gigluer is nice and clear

also if you have a softener cartridge style make sure is not over due for replacement therefor restricting the flow

check also that there are no filter screen on the water line see example here
Click Here (espressocare.com)
which could be located on any of the water lines fittings or the entry of the machine main one

solenoid valve clear and not gummed up

a lot of scale in the heating exchanger path (flowmeter has very small holes easy to get clogged)

last pump however if your pump is not getting enough water you can tell by the noise pitch that will make
if is only an adjustment issue while you are dispensing from the grouphead adjust the bypass pump screw so your gauge reads 8/9 bar

 
Stefano Cremonesi
info@espressocare.com
www.espressocare.com
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Bluedogbrewery
Senior Member


Joined: 16 Feb 2013
Posts: 4
Location: Portland, OR
Expertise: I like coffee

Posted Tue Jun 4, 2013, 12:00pm
Subject: Re: La Pavoni Pub V
 

I'm in the process of reconditioning my PUB V and I've run into a problem:  When I push the button to pull a shot (single or double), the motor and pump both run, but water does not flow from the group head.  A bit of steam and some dropplets exit from the group, but certainly not enough to pull a proper shot.  However, the brass in/around the group head gets very hot as if the hot water is nearly exiting, but a valve may be preventing proper operation.

Does anyone have an idea of what might be preventing normal water flow from happening at the group head?  Could it be associated with my solenoid perhaps?

Thanks for any input you can share with me.
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