Hi Jodi0,
I do not know this machine but have a delta 402 machine.
If it has a dial (like the 402) that goes round from low to high then 'flick' it up to reset and turn it all the way back to the level you want eg 'low'. If this does not work there may be a hole in the hose that operates the level control or may be the diaphram is itself has a hole.
Regards & Good luck with it.
KB, September 2008
