Does the Sentry Xpress have an error message for a temperature drop during a hold?

No. The 3-key Sentry Xpress Orton controller does not have an error message for a temperature drop during a hold, because the controller is used on enameling and bead-making kilns. The door is opened frequently during holds while enameling copper or annealing glass beads. Opening the door causes a temperature drop. On the other hand, the 12-key Sentry Orton controller has an LTDE low-temperature alarm.