Thanks for the response. We just replaced the battery following the SOP you linked, to no effect. Then, to be certain that it was not the battery, we placed a different cart in that slot, and that worked just fine. Then we took the original offending cart, took out the chip assembly and replaced it with a chip assembly from one of our flush carts. Now it reads just fine. Is it possible that the auto chip resetting function is not working as it's supposed to? How do we remedy that (we now have a flush cart with an inoperative chip/battery - not a big deal in the short term as we won't need to flush the system any time soon - but eventually we will need a fully functional cart)?