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Vibiemme Domobar - no water coming through head...?
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Discussions > Espresso > Machines > Vibiemme Domobar...  
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heidihi
Senior Member
heidihi
Joined: 21 Feb 2014
Posts: 3
Location: New Zealand
Expertise: Pro Barista

Posted Fri Feb 21, 2014, 2:55pm
Subject: Vibiemme Domobar - no water coming through head...?
 

Have tried to make my morning coffee...and after pulling an extraction I wasn't happy with, I have tried to do another but no water coming through the grouphead.
Water is coming through the hot water spout.

What can I do? Is this the pump? Pump is staying on for longer...help!
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stefano65
Senior Member
stefano65
Joined: 30 Oct 2004
Posts: 1,408
Location: Eugene OR
Expertise: Professional

Espresso: Vibiemme,Elektra,
Grinder: Vario,Macap,
Vac Pot: not
Drip: not
Roaster: not
Posted Fri Feb 21, 2014, 3:20pm
Subject: Re: Vibiemme Domobar - no water coming through head...?
 

I'm assuming you are dealing with a domobar super heating exchanger?

Start from the basic,
if the pump is indeed working or at least making noise when the brewing lever is on and the autofill (we'll get back to this part shortly)

first make sure water is MOVING and getting lower in the reservoir,
to do so
remove the bypass hose coming from the OPV valve and place it in a container apart from the machine reservoir,
lift the lever and see if the water starts to come out from the bypass before it reaches lets say 9 bar
if yes  then the OPV is opening too soon and needs to be adjusted and/or something is clogged in the grouphead (showerscreen dirty for example)
therefor the water is finding the path of less resistance.

if no water is not coming out from the OPV and the pump noise is quieting down after several seconds then there is a clog somewhere,
if the pump noise is not quieting down and no water is draw from the reservoir
then possibly the pump is bad
if so
do not insist in removing water from the boiler or you can risk to damage the Heating Element
infact I suggest removing one of the HE wires or NOT turning the machine on II
until you figure out about the pump issue


if you are dealing with a single stage boiler Domobar  and the hot water is working like you say and the pump is autofilling the boiler (level goes down in the reservoir)
then could be the OPV  as above or the grouphead clogged
almost all the above will be the same apart from the position 2 on the switch
therefor not having an heating exchanger you have water directly coming from the boiler

 
Stefano Cremonesi
info@espressocare.com
www.espressocare.com
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heidihi
Senior Member
heidihi
Joined: 21 Feb 2014
Posts: 3
Location: New Zealand
Expertise: Pro Barista

Posted Fri Feb 21, 2014, 10:25pm
Subject: Re: Vibiemme Domobar - no water coming through head...?
 

Hi again,
I'm pretty sure it is the domobar super heating exchanger.

We have taken the machine apart, and tested the water as recommended/ The water flowed, and I have also given it a good backflush - it also flowed well during this process. Was so excited that I may get a coffee!!

The autofill was working, however the pump noise didn't stop.

Where can I find a detailed diagram of the labeled parts of the inside of the machine?
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