RobMunro Senior Member Joined: 28 May 2014 Posts: 3 Location: Somerset West, South Africa Expertise: Professional
Posted Wed May 28, 2014, 3:56am 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.
skydragondave Senior Member Joined: 18 Feb 2013 Posts: 168 Location: Ontario, Canada Expertise: Professional
Espresso: Commercial Only Grinder: Commercial Only Roaster: Has Garanti HG5
Posted Wed May 28, 2014, 8:01am 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
Posted Wed May 28, 2014, 6:13pm 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
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