Help with Damper Control Box

I replaced the damper control box because the damper would not open and the fridge stayed warm. Now the freezer is 0 degrees but the refrigerator is below 30 degrees. The refrigerator seems to run continually and the damper doesn’t seem to close no matter how cold the fridge is, therefore allowing cold air to continuously be pumped into the fridge. I have tried to turn the fresh food control knob down (warmer) but this doesn’t help.

Here are your parts
Replacement parts for FRIGIDAIRE PLHS267ZAB6 Frigidaire/refrigerator | AppliancePartsPros.com

Here is a manual for this unit.
http://appliancedigest.com/index.php?/files/go/ffe6f8a8af84c6b3597ef091b3d44e06/frigidaire-refrigerator-sxs-2001-next-gen-service-manual-5995352423
You have to join the site to download the manual but it is free and this is a very good site for manuals and other info for the appliance repair DIYer.

And here is the tech sheet
http://manuals.frigidaire.com/prodinfo_pdf/Anderson/240389609.pdf

I am not sure what you mean by “damper control box”
Did you replace the fresh food thermostat (Item F21 in Section 5) or the actual damper (Item 115 in Section 5)?

The manual has a pretty good explanation how this works.

Control box kit was
replaced Part Details - FRIGIDAIRE Control Box Kit, part number: AP5176342
damper remains open until defrost cycle, no matter how cold the fridge is.
When defrost cycle is complete, condenser starts, freezer fan starts, damper opens and closes numerous times before it decides to stay open.
damper remains open again until next defrost cycle continuing to pump cold air into fridge. Cannot get fridge above 30 degrees.

The link you gave for the service manual shows an error page. I registered but cannot find the service manual you are referring to.

Yes I just tried the link and the same thing happened.

But when I signed in and then went to it I was able to download it. Must be something weird with the site.
It is
“Frigidaire Refrigerator SxS 2001 Next Gen Service Manual # 5995352423”
on Page 3 of the “Refrigerator Repair Service Manuals” in the Downloads section.

Just had another person with damper problems following is what they found.
http://forum.appliancepartspros.com/refrigerator-freezer-repair/313441-frigidaire-problems-replaced-control-box-kit.html

I am going to the cottage for a few days so will not be available.
When the forum is busy if other regular posters see that the post is being answered they do not have the time to check the post. So If you require help when I am gone you may want to start a new post with a blurb about what you have done so far and a link to your original post.