Welcome back to ManageMyLife.com! Thank you for providing more information on this issue. Once you manually advance the timer, if it cycles completely without any more problems, this indicates a faulty timer. Below are instructions on replacing a timer. I have included a link to our PartsDirect page where you can purchase the part you need to complete your repair. Just click the blue link below to be taken to the page.
Timer for Frigidaire Washer Model # FWS1233FS0
1. Unplug the washing machine from the wall.
2. Remove the screws from the faceplate of the machine. Remove all the screws from the top of a front-loading washing machine, around the cover. Slide the top of the machine off to expose the inside of the faceplate. Slide a putty knife under each side of the faceplate when working with a top-loading machine to unclip the faceplate, then push back to expose the inside.
3. Pull off the knob of the timer control switch to expose the mounting screws.
4. Pull on the wire connectors on the back side of the switch to unplug the timer. Pull by the connectors, not by the wires, to prevent damage. Mark the wire with masking tape so the wires are not mixed up.
5. Remove the mounting screws on the front of the timer switch. Pull the switch out of the unit.
6. Insert the new timer switch and tighten the mounting screws. Reconnect the wires and replace the screws on the front panel.
SAFETY NOTICE: Be sure to disconnect power to the appliance before performing any repairs. If you are not comfortable with doing any voltage checks that might be recommended, please contact your local service provider for repairs. Be aware that there could be sharp edges inside the appliance that could cause cuts or other injuries to yourself or others.
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
If you have further questions please let me know. Thanks for using ManageMyLife.com.