If I understand then the following modification of John's formula will display "<>" if final D.O. is less than 1 and depletion is less than 2:
Formula:
=IF(AND(C2>1,D2>2),ROUND((F2*300)/(A2),0),IF(AND(C2<1,D2<2),"<>"&ROUND((F2*300)/(A2),0),IF(D2<2,"< "&ROUND((F2*300)/(A2),0),IF(C2<1,"> "&ROUND((F2*300)/(A2),0)))))
If I have misunderstood, please upload a sample of the file where the #value error is being displayed along with what you want the cell to display in this situation.
Let us know if you have any questions.
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