!!??Using a formula to change the colour of font!!??

I have been trying for days to change the colour of font in a cell to red from black when the number in the cell goes above a set number for example when a number equals or goes above 12,000 it should change colour to red. But i can not work out a formula to work this.

The formula i tryied was:

=if((e15)>=12000,[red],(e15))
and i also tried
=if((e15)>=12000,"Due Overhaul",(e15))

But all i recieved was an error message for both!!

Any idea on how i can make it work????

WOW it works!! All that trying and head scratching and it was so simple!!

Thanks alot!!