Oh yes, i got so much pressure that i crushed two crummy Hozelock reels in a row and blew the connectors off a couple of times, so reset your main dial to about eleven o'clock and only move the blue dial in very small stages.
Thanks for that, will give it a try

Dont mind running the varistream on full, but it isnt giving me much pressure, so havent got much leeway for first cleans etc.
Is the green light flashing on the varistream with the system running and the brush connected ? if it is the battery need charging.
Have you recently changed resin etc? could be an airlock
Hope this helps 
Have changed the resin, yes, but its before the tank, so shouldnt be a problem?