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Date: 15 Nov 2006 04:53:44
From: Anthony Altieri
Subject: Three-year old Isomac: Slow brew pressure
Recently my Isomac TEA has been acting a little off. When I load up a
packed portafilter, or blind filter for backflushing, the pressure is
much slower to build up to 9-10 bar than it has been in the past. It
used to ramp up in 5-10 seconds, then wham - hold right at 9-10 bar on
the brew pressure gauge. Now it takes 10+ seconds, and doesn't seem to
peg as solidly as it did in the past.

When I just flush water, the water debit *seems* to be fine... I've
honestly never measured/time it before, so don't have an exact
reference for comparison. It takes 30 seconds to flush 4 oz of water
with no portafilter. With the blind filter in, it takes 15 seconds to
reach max brew pressure. Checked the water softener end of the intake
tube, and it's not obstructed.

Has anyone experienced this before on this type of home HX machine?
Any advice on first things to check out inside?

Much appreciated,
Anthony.





 
Date: 16 Nov 2006 16:18:09
From: Felix
Subject: Re: Three-year old Isomac: Slow brew pressure
Anthony Altieri asks:
> I did see Jim Schulman's faq for descaling an HX machine,
> very helpful. One question - I have an old pack of "Gaggia
> Baby Cleaner" descaler that I bought when I had my Espresso.
> Does anyone know if that can be used to descale my TEA?

If I remember correctly, Gaggia didn't publish a list of ingredients
for this cleaner. I don't think it smelled obnoxious, so I think it
would work, but since you probably have to buy descaler anyway, why
take a chance?


Felix



 
Date: 16 Nov 2006 04:31:06
From: daveb
Subject: Three-year old Isomac: pump?
Yes, pumps do fade over time, just before they fail completely.


It is seldom an instant occurence, unless it has been left on for a
long period and burned up.

[That is not the problem here]

ciao
dave



 
Date: 15 Nov 2006 09:45:39
From: Anthony Altieri
Subject: Re: Three-year old Isomac: Slow brew pressure

Anthony Altieri wrote:
> Recently my Isomac TEA has been acting a little off. When I load up a
> packed portafilter, or blind filter for backflushing, the pressure is
> much slower to build up to 9-10 bar than it has been in the past. It
> used to ramp up in 5-10 seconds, then wham - hold right at 9-10 bar on
> the brew pressure gauge. Now it takes 10+ seconds, and doesn't seem to
> peg as solidly as it did in the past.

Thanks for the replies so far. I did try it without the stock cation
filter, and the result is the same. I did think that the pump may be
the issue, but I wasn't sure if ulka pumps got 'tired' or not, or if
they just failed out right.

As for the brewgroup filter, I don't think that's the culprit, because
if it was clogged, brew pressure would still be high even if flow was
reduced, right? Maybe not.

As for descaling, I have never done so on this machine. I've been
using my relatively not-hard tap water for the entire life of the
machine, with just the stock softener cartridge. I understand these
may not be the best things in the world to start with, and by now
probably needs to be re-charged.

I did see Jim Schulman's faq for descaling an HX machine, very helpful.
One question - I have an old pack of "Gaggia Baby Cleaner" descaler
that I bought when I had my Espresso. Does anyone know if that can be
used to descale my TEA?

Thanks,
Anthony.



 
Date: 15 Nov 2006 09:20:11
From: stefano65
Subject: Re: Three-year old Isomac: Slow brew pressure

Start removing the showersreen and see if it is cloge








Randy G. wrote:
> Try it once without the water filter. it may have some loose bits that
> are clogging the filter when larger amounts of water or water at
> greater speed goes through it.. Just a thought to eliminate one
> possible cause. next, have you been using tap/hard water, and if so,
> have you descaled recently? Finally, does the hot water wand dispense
> water at the same rate as it use to?
>
> Not so much solutions, but places to start...
>
> Randy "on your k.. get set... BREW!" G.
> http://www.EspressoMyEspresso.com
>
>
>
> "Anthony Altieri" <altieri@optonline.net> wrote:
> >
> >Recently my Isomac TEA has been acting a little off. When I load up a
> >packed portafilter, or blind filter for backflushing, the pressure is
> >much slower to build up to 9-10 bar than it has been in the past. It
> >used to ramp up in 5-10 seconds, then wham - hold right at 9-10 bar on
> >the brew pressure gauge. Now it takes 10+ seconds, and doesn't seem to
> >peg as solidly as it did in the past.
> >
> >When I just flush water, the water debit *seems* to be fine... I've
> >honestly never measured/time it before, so don't have an exact
> >reference for comparison. It takes 30 seconds to flush 4 oz of water
> >with no portafilter. With the blind filter in, it takes 15 seconds to
> >reach max brew pressure. Checked the water softener end of the intake
> >tube, and it's not obstructed.
> >
> >Has anyone experienced this before on this type of home HX machine?
> >Any advice on first things to check out inside?
> >
> >Much appreciated,
> >Anthony.



 
Date: 15 Nov 2006 08:26:09
From: Randy G.
Subject: Re: Three-year old Isomac: Slow brew pressure
Try it once without the water filter. it may have some loose bits that
are clogging the filter when larger amounts of water or water at
greater speed goes through it.. Just a thought to eliminate one
possible cause. next, have you been using tap/hard water, and if so,
have you descaled recently? Finally, does the hot water wand dispense
water at the same rate as it use to?

Not so much solutions, but places to start...

Randy "on your k.. get set... BREW!" G.
http://www.EspressoMyEspresso.com



"Anthony Altieri" <altieri@optonline.net > wrote:
>
>Recently my Isomac TEA has been acting a little off. When I load up a
>packed portafilter, or blind filter for backflushing, the pressure is
>much slower to build up to 9-10 bar than it has been in the past. It
>used to ramp up in 5-10 seconds, then wham - hold right at 9-10 bar on
>the brew pressure gauge. Now it takes 10+ seconds, and doesn't seem to
>peg as solidly as it did in the past.
>
>When I just flush water, the water debit *seems* to be fine... I've
>honestly never measured/time it before, so don't have an exact
>reference for comparison. It takes 30 seconds to flush 4 oz of water
>with no portafilter. With the blind filter in, it takes 15 seconds to
>reach max brew pressure. Checked the water softener end of the intake
>tube, and it's not obstructed.
>
>Has anyone experienced this before on this type of home HX machine?
>Any advice on first things to check out inside?
>
>Much appreciated,
>Anthony.


 
Date: 15 Nov 2006 06:52:06
From: daveb
Subject: Re: Three-year old Isomac: Slow brew pressure

mebbe the pump is getting a little "tired" or the OPV is off.


Dave
159.5



 
Date: 15 Nov 2006 06:51:46
From: daveb
Subject: Re: Three-year old Isomac: Slow brew pressure
How old?

mebbe the pump is getting a little "tired" or the OPV is off.


Dave
159.5