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Isomac Venus - pressure problem
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petr_cz
Senior Member


Joined: 6 Aug 2012
Posts: 12
Location: Haarlem NL
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Macap MC4
Posted Wed Apr 17, 2013, 6:15am
Subject: Isomac Venus - pressure problem
 

Hi everyone,

I need help or advice, how to fix my espresso machine.
Until now my Isomac Venus was working very well, with high pressure, no problems, no troubles. However today the pressure stopped working, normally the pressure is around 12 bars, but now only 2!!! The machine is 5 years old. Can I fix it on my own (how????), or better bring it to the authorized service?
It sucks, just in the moment after buying nice fresh beans :-(

Thank you very much for your help in advance.

Greetings,

Petr
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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 Wed Apr 17, 2013, 6:33am
Subject: Re: Isomac Venus - pressure problem
 

Your Venus is a single stage boiler with an adjustable OPV valve and a solenoid valve for the group,
first place to look is the return hose and see if the water is been diverted out of it
of course this after machine sure that all the obvious parts are cleaned (showerscreen solenoid valve etc etc
see our web page for schematic reference

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


Joined: 6 Aug 2012
Posts: 12
Location: Haarlem NL
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Macap MC4
Posted Wed Apr 17, 2013, 8:00am
Subject: Re: Isomac Venus - pressure problem
 

Thank you for your advice.
The return hose is ok, the water is going out. I cleaned everything except solenoid valve. How can I clean this?
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Frost
Senior Member
Frost
Joined: 26 Jul 2007
Posts: 2,116
Location: Sierra
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Lelit PL53
Roaster: Poppery I w/variac, MET, BT
Posted Wed Apr 17, 2013, 8:58am
Subject: Re: Isomac Venus - pressure problem
 

You will have to get more details on the problem:

Pressure goes only to 2 bar during a double shot.

Does the pump sound as running normal?

Is there a flow of espresso out the portafilter and if so, is it more or less than a normal?

During the shot, check for flow into the drip tray (this would indicate the 3-way valve is a problem)

During the shot check for flow from the return line into the water tank. (this would indicate a problem with the OPV)

If there is no flow anywhere, look to the pump.
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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 Wed Apr 17, 2013, 1:37pm
Subject: Re: Isomac Venus - pressure problem
 

that's the point
water should not go out from the OPV until the pressure reaches 9-10 bar
if it opens at 2 then your OPV needs to be adjusted or cleaned or replace the closing gasket inside

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


Joined: 6 Aug 2012
Posts: 12
Location: Haarlem NL
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Macap MC4
Posted Thu Apr 18, 2013, 2:59am
Subject: Re: Isomac Venus - pressure problem
 

Thank you guys for help. You were right, the problem was with OPV. I have never heard about OPV before :-) Thanks!!!!
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