Inspector wrote...
In T2 I have this formula:

=IF((N2<(U2-80)),U2-(N2+80),0)

Unnecessary parentheses. Also, no IF needed. Try

=MAX(0,U2-N2-80)

In U2 I have this formula:

=IF(A20,VLOOKUP(A2'SHEET1'!$A$2:$C$288,3,FALSE)* 10,"")
...

Looks like you made a typo, and the formula should be

=IF(A20,VLOOKUP(A2,SHEET1!$A$2:$C$288,3,FALSE)*10 ,"")

. . . However, when A2 is blank, #VALUE is displayed in T2 because of
formula in
U2. I need T2 to be blank until a number is entered in A2. . . .

Change T2 to

=IF(A20,MAX(0,U2-T2-80),"")


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hgrove
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