[Python] Iterate over a Dataframe column and find value based on condition

I have a Dataframe with 2 columns. I want to compare the value of first column with some threshold for 5 iterations and if it exceeds that value, check the corresponding value of the another column

DF: In the below example I need to check at what value of 'Inst' where 'Error' was less than 2.5 for next consecutive 5 iterations

Expected result: Inst was 204273 204302

Below is what I tried but it did not work. Any pointers or better way of implementing it would be nice

count = 0
for i in range(len(df["Inst"])):
while count < 6:
if df["Error"] < 2.5:
count += 1
continue
result = df["Inst"][i-5]


Below is my DF:

Error Inst
0 2.595795 204267
1 2.568556 204268
2 2.562618 204269
4 2.538956 204271
5 2.520247 204272
6 2.498345 204273 #
7 2.474890 204274
8 2.467736 204275
9 2.471115 204276
10 2.466424 204280
11 2.495388 204284
12 2.520301 204285
13 2.604358 204291
14 2.553243 204299
15 2.490774 204302 #
16 2.452384 204303
17 2.434171 204304
18 2.404764 204305
19 2.388775 204306
20 2.384337 204307

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