See the attached document to diagnose and try to free a stuck relay in molbox1, molbox1+ or molbox RFM flow terminal. It basically describes how to use the front panel buttons to cycle the relays. Note that with molbox1+ firmware version 6.01 the keys to press to enter diagnostic mode have changed. New method is to press and hold the left and right arrow keys at the same time.
Another possibility would be that the cable from the back panel printed circuit board has come loose from the driver board. This is easy to inspect by removing the top cover of a molbox1 or molbox1+ terminal.
If you have a problem with a single molbloc you can check it with the article at this link, Check molbloc PRT or ACAL 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 at +1.877.355.3225 or the below link.
If you have technical questions contact Flow Technical Support at the same phone number or at the below link.