See this document to diagnose a PRT error with a molbloc flow element. The molbox can also be the source of a PRT or ACAL error.
If the problem occurs with only one molbloc element then check that molbloc with the below document.
If the problem occurs with more than one molbloc then check the molbox with the document at this link, molbox ACAL or PRT error
If this procedure does not work contact Fluke Calibration Service for a RMA number to return the molbloc element or molbox terminal for evaluation/repair. By phone +1.877.355.3225 or the below link.
If you have technical questions contact Flow Technical Support at the same phone number or the below link.