The Excel ISERR function returns TRUE for any error type except the #N/A error. You can use the ISERR function together with the IF function to test for an error and display a custom message, or perform a different calculation if found.

**Syntax**:= ISERR (value)

The ISERR function syntax has the following arguments:

**Value**(required argument) – This is the expression or value that needs to be tested. It is generally provided as a cell address.

**Example**: Let’s look at some Excel ISERR function examples and explore how to use the ISERR function as a worksheet function in Microsoft Excel:

**Syntax**: =ISERR(A2)

**Result**:

Based on the Excel spreadsheet above, the following ISERR examples would return:

**Syntax**: =ISERR(A3)**Result**: TRUE

**Syntax**: =ISERR(A4)**Result**: FALSE

**Syntax**: =ISERR(A5)**Result**:TRUE

**Syntax**: =ISERR(A6)**Result**: FALSE

**Syntax**: =ISERR(A72)**Result**: FALSE

**Syntax**: =ISERR(A8)**Result**: FALSE

**Syntax**: =ISERR(A9)**Result**:FALSE

**Note**:

Use the ISERR function to see if a cell has an error except for #N/A. This includes #VALUE!, #REF!, #DIV/0!, #NUM!, #NAME?, or #NULL!

For example, =ISERR(A1) will return TRUE if A1 is is displaying the error message mentioned above.

Normally, **value** is supplied as a cell address.

ISERR is part of a group of functions called the “is” functions, which are often used to test the result of formulas for errors.