The F1 fault code on this washer indicates that the water level pressure transducer signal is out of range. This can be caused by the pressure transducer air hose tubing being pinched or crimped. A failed pressure transducer on the machine control board can also cause it.
The first image below shows the method for accessing the pressure transducer tube that runs from the bottom of the washer tub to the machine control. I recommend checking this air hose for pinches, twists or crimps.
NOTE: Be sure to unplug the washer to disconnect electrical power before accessing internal components.
If you find no problems with the pressure transducer tube, then the machine control board will need to be replaced. The procedure for accessing and replacing the machine control board is shown in the second image below.
Make sure to unplug the washer before attempting any repair of the washer.
If you need more help with this washer, please submit additional details.
Here is a link to order any parts you need.
Sears Parts Direct
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