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RobMunro
Junior Member
RobMunro
Joined: 28 May 2014
Posts: 1
Location: Somerset West, South Africa
Expertise: Professional

Posted Wed May 28, 2014, 4:56am
Subject: Linea SinglePhase Issues
 

Hi there
I have a Linea 2 group head single phase machine and use it on my mobile unit.  It is a great machine but as of late it is failing to keep up with steam as the pressure is dropping.  It is extrememly well maintained and I am wondering if there are any ideas out there as to what may be causing the loss of steam.  

The loss occurs when we are busy and the pressure drops quickly to between .5 and .85 bar and doesn't recover back to 1.5 unless we wait.  This is obviously an issue when busy.

Any ideas or hints to fix this?

Thanks
Rob
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skydragondave
Senior Member


Joined: 18 Feb 2013
Posts: 167
Location: Ontario, Canada
Expertise: Professional

Espresso: Commercial Only
Grinder: Commercial Only
Roaster: Has Garanti HG5
Posted Wed May 28, 2014, 9:01am
Subject: Re: Linea SinglePhase Issues
 

Are you using softened water?
Water usually has an amount of dissolved solids like calcium that if left untreated can build up inside the steam boiler in the form of scale. This scale acts as an insulator to reduce the efficiency of the water heating system. It also eventually plugs passages, valves and pipes to the point that flow of water and steam becomes blocked. This damage is very expensive to correct. So have your water quality checked for carbonate hardness and have a technician evaluate the level of scale in the boiler. There are other possible causes but this is the most common one. Good luck
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fnacer
Senior Member


Joined: 25 Feb 2007
Posts: 465
Location: Denver
Expertise: I love coffee

Espresso: Salvatore E61, Vivaldi Mini...
Grinder: Mazzer Mini, Gaggia MDF,...
Roaster: Behmor 1600
Posted Wed May 28, 2014, 7:13pm
Subject: Re: Linea SinglePhase Issues
 

Assuming "extremely well maintained" means that the machine is regularly descaled, the issue could be any number of things:

1) Slow heating due low electric voltage
2) Slow heating due to defective heater element
3) Delayed activation or premature deactivation of the heater due to failing pressurestat
4) Too little steam in the steam boiler due to water level being too high
5) Too little steam in the steam boiler due to steam escaping through a leak somewhere
6) Too little steam in the steam boiler due to air not getting released

My bet is on #2 or #3.
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