I have not had this problem with mine, but when I first got mine I had another problem that would not allow the unit to function. The sensor that monitors the fluids was stuck and would not allow the unit to engage. I emailed the U.S. distributor and they were very helpful.
If you are having trouble with yours I highly recommend contacting them.
ultra@ultrasystem.com
If you are having trouble with yours I highly recommend contacting them.
ultra@ultrasystem.com