We've had similar issues with Garaventa units and the Garaventa tech support not helping us.... however we've bypassed this problem by getting in contact with a garaventa mechanic to help us troublehshoot.... Apparently the field guys are pretty good at troubleshooting over the phone and they're willing to help out as well. not sure if that helps, if i come across any prints ill send them along.

side note - what is the issue youre having? just shutdown not running completely? did something happen and cause it to stop running? or is it another issue?