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Wierd Fault
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Stratocaster
Senior Member


Joined: 15 Apr 2011
Posts: 12
Location: Port Elizabrth South Africa
Expertise: Professional

Espresso: Breville 900d
Grinder: San Marco
Vac Pot: No
Drip: No
Roaster: No
Posted Mon Apr 18, 2011, 12:53pm
Subject: Wierd Fault
 

When pulling a shot pump pressure goes up to 9 bar, OK, No problemo, but when shot is finished gauge stays at 9 bar then
takes about 5 minutes to drop to the normal incoming mains pressure. found this fault only about four times in the last six years
and once, the pressure actually crept from 9, slowly up to 12 bar with the pump off . Anyone else had this and found the cause ?
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BenjaminZeman
Senior Member
BenjaminZeman
Joined: 10 Mar 2011
Posts: 5
Location: Brattleboro, VT
Expertise: Professional

Posted Mon Apr 18, 2011, 1:47pm
Subject: Re: Wierd Fault
 

I had this problem at an account recently. I didn't do the repair myself but was told that it was a clogged water line. There could also be a problem with the pressure stat.
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Stratocaster
Senior Member


Joined: 15 Apr 2011
Posts: 12
Location: Port Elizabrth South Africa
Expertise: Professional

Espresso: Breville 900d
Grinder: San Marco
Vac Pot: No
Drip: No
Roaster: No
Posted Fri Dec 7, 2012, 3:21pm
Subject: Re: Wierd Fault
 

Thanks for the reply benjamin, I have since found the cause and subsequently put right three more machines. The fault is a slow leak in the non return valve feeding the pump pressure line. When the new cold water in the heat exchanger gets warm it expands pushing backwards to the pressure gauge hence a reading of 13 bar. Franko
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