Hardy Cross is moment distribution, if you're familiar with that.
I'm not really going to look at this, but your first internal sanity check should always be to draw a shear and moment diagram. Get your reactions, draw your diagram and then cross check the different bits to make sure they're internally consistent (forces add to zero, moments sum properly, things are zeroed where they're supposed to be, etc). If that's still not fixing things, try another method. If you don't know one, teach yourself one, or do a check on a computer. If you've got two different methods coming to the same answer it generally means you're right or it means that your assumptions are wrong somehow.
Learning to check and verify your own work is important, so it's a good exercise.
I'd probably check by doing the simple span analysis of the two exterior supports, checking the deflection at the middle support location, calculate the load you need to apply on the two support span to deflect the centre support back to 0 deflection and then add the two envelopes.