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The FH error code indicates that the Central Control Unit does not detect water entering the machine or that the water level pressure switch trip has not been detected.
If no water is entering machine follow these troubleshooting steps:
Check the water supply cut-off faucets behind the washer to make sure that they are fully open.
Check the drain hose for a siphoning problem.
Shut off the water supply faucets for the washer. Remove the inlet hoses from the connections on the back of the washer. Check the inlet water screens for clogs. Place the ends of the inlet fill hoses into a bucket and briefly turn on the cut-off faucets to check for proper water pressure and flow from the inlet water hoses. If you have inadequate water pressure or flow, I recommend having a plumber fix your water supply to the washer.
If the washer is filling with water you could have a problem with the water level pressure switch, a siphon problem or a Central Control Unit problem. I would need more details regarding the water level in the washer and the full model number of your HE3t washer to accurately predict the failure. I recommend that you resubmit your question with this additional information. We will be glad to help you further with this problem.
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
If you would like specific help with your washer, please include the model number and more details in a reply to this post.