What is ISERROR?
Returns TRUE if the value is any error type. Broader than ISNA which only checks #N/A.
Syntax
=ISERROR(value)
Example
Formula: =ISERROR(A1)
Result: TRUE or FALSE
How It Works
Returns TRUE for any error: #N/A, #VALUE!, #REF!, #DIV/0!, #NUM!, #NAME?, #NULL!. Use IFERROR for simpler handling.