Evaluating If condition in Jmeter based on values in CSV

Having massive problems with something that should be simple, due to my lack of understanding of jmeter.

I have a test consisting of:

CSV Data Set config
Http Request
If controller(containing Json Path extractor and an assertion)

I only want the contents of the If statement to execute if a particular variable in the CSV is set to 'Y'.

Variable name in CSV = Check_For_Selector The condition I've placed on the IF is "${Check_For_Selector}"="Y"

This doesn't work and I can't work out why.

Please note that I am using Jmeter 2.13 (forced to use this rather than 3.1).

What the heck am I doing wrong?