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The nF error indicates a long fill. When the water fill continues for more than 16 minutes or there is no change of water level for 3 minutes. Check the following:
Check the water valve wiring harness.
Check the water supply valve for clogging with foreign material and whether water is supplied properly.
Check for reversed fill hoses.
Check water temperature, if sensed as higher than 50 degrees C (122 Fahrenheit) in the Wool or Lingerie cycle it will create this error.
Check the relays, if they operate correctly replace the Main PCB.
If you see nF1, it means the hoses (hot and cold) are reversed.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website;
Sears Home Services
Here is a link that you may use to view the parts list diagram or purchase any parts needed for your appliance;
Sears Parts Direct
I hope this is helpful. Check the things I have covered here and if I may be of further assistance please reply to this post.