Omron ZX Series Operation Manual page 150

FUN (Function) Mode
n Errors when Confirming a Numeric Value
A setting error will occur under the following conditions.
1. When the set value is too large.
2. When the set value is too small.
If an error occurs, the relevant error will be displayed on the sub-display
three times at one-second intervals as shown in the following figure, and
then the previous set value will be displayed.
1. Errov (Error: Over)
The error is displayed when the ENT Key is pressed.
130
2. ErrUd (Error: Under)
Section 4-5