I have a QSF 430l-3u neg processor. Today it came up with an error message 121 Circulation flow down I have cleaned everything all lines pumps etc. Even the plastic H in the tank was removed and cleaned. I have replaced pumps with others from my spare parts. The flow sensor has been replaced as well. Unfortunatly I don't know if the replacement is good or not as it was just in my spare parts box. Can it be bypassed some how to check that is the issue. When you turn on the machine with the rack out there appears to be lots of turbulance in the tank. That why I am thinking it is the flow sensor. Also new filter inststaled as well. Any other suggestions or ideas would be appreciated.
Thanking you in advance