How to Troubleshoot & Replace Ge AP3995038 / WH12X10348 Timer

Easily removed the old one and installed new one. It took 15 minutes or less. I ordered the part on a Thursday afternoon and had it in my hands in under 24 hours. Very impressed that when they said it would be shipped the same day when ordered. I never expected it to arrive the next day considering it was the height of last minute Christmas shipping. 

Pulled the knob, noticed that the timer gear which is operated by the knob was starting to wear, so I ordered both the knob and timer. Removed 3 hex screws in back of washer to expose the timer, removed one hex screw on the timer, the wire harness, and timer with a sligt twist, Reversed the procedure to reinstall. It took more time to get my tools and move the dryer and then the washer to expose the back of the washer. Wish all repairs were this easy. By the way, part arrived in one day. 

Removed the old switch and using the model number from the part I ordered another. 

Replaced the knob and timer assembly.fairly straightforward easy repair 

Ordered parts - very simple repair followed video provided by appliance parts - removed clip dial and plate - removed 3 screws from control panel- unplugged broken timer - plugged in new timer - closed control panel - replaced dial clip and plate. 

Replaced timer and knob. Very easy took only ten minutes. 

Ordered part,received in 2 days, repair took about 45 minutes, appliance back in action 

I replaced the knob and timer switch as both had worn engagement teeth. 

Found belt 'shavings' underneath motor as part of diagnosis process. Decided to replace both timer(1) and belt(2). Repair 1 was very simple. Most difficult part was removing the three screws holding the panel. Really it was my fault as I took the lazy man's was out by not pulling the machine away from the wall. I'm tall so I reached over the top. The swap was very simple. One screw releases the unit. Releasing the plastic clip holding the knob/dial took a couple of tries mostly because it is difficult the see in the tight space. Reassembly was easy with the new parts. Item 1 took 5-7 minutes tops. Repair 2 -- is tricky and works better with two people in my experience. Absolutely need the install tool and good, strong zip ties. On the first two tries, I used the small ones from my assortment. got 3/4 of the way around before 1 broke. For the third try, I used two of the long thick ones and that did the trick. I also had my son turn the drum from above while I turned the wheel and guided from the bottom. Considering the 'floating' nature of the tub and the tight quarters below, it would be quite a challenge for one person. Ran the washer through a cycle, vacuumed up the rubber residue and buttoned her up. Now, Mom is happy so, as the saying goes, everyone is happy! Repair 2 took maybe 15 - 20 minutes. Use heavy duty zip ties at the start and you'll shave that time. 

Ordered timer from Appliance Parts Pro, arrived in 2 days and took 10 minutes to remove old one and install new one. Thank you so much!!!