[dai]

I've used a digi varistream since they first came out (3 to 4 years ago I think?) I spent the time to fully understand how it works & set it up properly. I'll tell you now, 80% of users I come across haven't a clue! Mine works perfectly, day in ,day out, every day. Couldn't be without it!
[/quote]

I have one about the same age, mine does play up at times, it's definitely temperature sensitive.
I think my problems stem from using too small a diameter pole hose, the Algarde hose is only 4mm I/D.
If it's cold first thing in the morning it's fine, but when the sun gets stronger I have to reduce the cut off pressure to stop the pump cycling.

[STEVE-UK]

I've been using them for 5 years and have not had a single problem.

Maybe you know how to use them properly? 

I know that when mine work, they work lovely, but when they haven't worked properly, it's because I hadn't set the system up correctly.

Someone in another post mentioned it's worth putting in the effort to get them working properly, and my early/inexperienced feeling is that, that's good advice.

I've used a digi varistream since they first came out (3 to 4 years ago I think?) I spent the time to fully understand how it works & set it up properly. I'll tell you now, 80% of users I come across haven't a clue! Mine works perfectly, day in ,day out, every day. Couldn't be without it!

i have 3 other digital varistreams which work with no issues its just the latest one which is the problem