ecelis Senior Member Joined: 19 Aug 2008 Posts: 22 Location: Tampa FL Expertise: I live coffee
Espresso: Alex Duetto II Grinder: Mazzer Mini Roaster: Behmor
Posted Tue Aug 19, 2008, 8:21am Subject: How do I decalcify an Isomac Venus?
I have lost water pressure on my Venus. It has a 3-way solenoid valve do I backflush? (there is no blank portafilter screen, do I purchase one?). Or do I add the solubilized decalcifyier (Cleancaf, Dezcal) to the water tank?
Posted Tue Aug 19, 2008, 4:35pm Subject: Re: How do I decalcify an Isomac Venus?
Venus does have a 3-way, so regular backflush is a good idea. I use water every day, cleancaf once a month or so. Descale as any single boiler. These address 2 different issues: one is coffee residue, the other is water scale. One is descaled with acid (the boiler) , and the coffee (3-way backflush) is cleaned with detergent. Never put detergent in your boiler.
Posted Wed Aug 20, 2008, 8:25pm Subject: Re: How do I decalcify an Isomac Venus?
Has it been sitting around for a long time? You might need to rebuild or replace the pump. They can scale up.
As much as I admire Stefano, perhaps he will clarify about not backflushing. He has helped me personally and is generous to post here at all. More of an expert than I will ever be, and a generous man. Good to do business with.
I would descale several times following the same proceedures as for a silvia or any other high quality machine. Should be easy to find.
I'll check back in this weekend. If you need pointers to the pump rebuild click here Whoever posted this has helped me a lot. This will give you insight into pretty much any inexpensive pump. A logical person can work it out on their own but why not use thie generous help.
You might want to descale more often, source softer water, etc. For this one I might go for dezcal or another super-effective solution. I descale with citric acid, (it's cheap) but have yet to let one get that far. Probably will next week 'cause I am scary busy.
Posted Wed Aug 20, 2008, 9:15pm Subject: Re: How do I decalcify an Isomac Venus?
You will need to provide more detail for anyone to help diagnose the problem(s). Do you have any water flow when you turn on the pump? (from steam wand or group) does the pump make any noise when you turn it on? Routine de-scale and backflush is a good idea, but if there is no water pumping through the machine you will not be able to do either.
stefano65 Senior Member Joined: 30 Oct 2004 Posts: 1,385 Location: Eugene OR Expertise: Professional
Espresso: Vibiemme,Elektra, Grinder: Vario,Macap, Vac Pot: not Drip: not Roaster: not
Posted Thu Aug 21, 2008, 7:13am Subject: Re: How do I decalcify an Isomac Venus?
Right single stage with solenoid ....................................... too many models to keep track yes can be backflush but just like a silvia very short session howevere like mention above if there is no water coming out to star with it's pretty useless BEFORE doing much more the the machine remove one of the wire from the heating element so there is no chances to burn it out in the process like mention above more info can help e little things worth a try: with the machine unplugged you can open the steam valve and blow some compress air from the pump inlet and see if air reaches the opening ( sometimes this will unstuck the pump if the pump is stuck) then you can remove the solenoid valve and grouphead parts to see if the clog is there ( must likely yes it will there)
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