What does Mgt Control mean on an SX-680 Geller Towa till?

Mgt Contro has appeared on our SX-680 till and we don't know how to clear it. We have the full instruction manual but we can't find anything relating to this wording in it...
Mustang75, April 2016


done
Hi. Try turning the power switch off. Then turn the key to P2 position. Turn power back on. Turn key to R and try it

Registerman, April 2016
link Click here to see other fixes for Geller.