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Tyler Z.
Tyler Z., Appliance Doc
Category: Appliance
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Experience:  9+ years being an appliance technician with factory training.
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washer will not go thru 1st cycle . it makes loud thumping

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washer will not go thru 1st cycle . it makes loud thumping noise then shuts off and flashes F-51. What is the problem
Hello, and thank you for using this service. I'll be helping you with your problem today.

Do you have a model number so that I can better assist you? It should be located on a sticker below the lid down by the hinges (not on the lid itself). It's hard to see because it's covered by the bottom of the lid, but if you look you should be able to find it.
Customer: replied 3 years ago.

model mvwb300wqo

Perfect, thank you. XXXXX means that your RPS sensor is acting up, but you'll want to take the washer apart and see if something is stuck between the inner and outer tub first. If you find nothing, then the RPS sensor will need to be replaced. The most common problem is a nut below the inner tub that needs to “float”. Floating is when the tub fills up with water to a certain level the inner basket will rise about 1 inch from the center agitator. What this does is disengage the basket from the motor so that the agitator can rotate independently from the basket. If the basket does not float then when it tries to agitate the whole basket will turn back and forth at the same speed as the agitator and this will cause the F51 error code.

To fix the problem if the basket is not floating you will have to take the washer apart. Below are the steps to follow if you are mechanically able to tackle it:

1. Unplug the power cord

2. Lift the top of the washer up, to do this there are 2 latches in the seams between the top and
the bottom sections. These latches are about 6 1/2 inches from the right side and left side of the washer. You need to insert a small screwdriver (be careful not to scratch the paint) and push the latch while lifting the top section.

3. The top will actually fold back leaving the inner tube fully exposed. Support the glass lid so it doesn’t get damaged because it is very heavy and will fall open when you flip the top back.

4. Remove the plastic top of the tub. There is one hose connected at the back and there are several snaps around the outer edge that hold it on. Remove the hose and unsnap the snaps and set it aside.

5. Remove the cap covering the very center of the agitator. It is just snapped in place and can be pried off with a small screwdriver.

6. Remove the center screw under the cap.

7. Remove the agitator, you need to lift it evenly and might have to work your way around by pulling on one of the three fins and then the next and so on. I also had luck using a small pair of needle nose pliers and grabbing a small lip inside the area where the screw was and pulling from there.

8. Remove the 6 Phillips screws in the middle holding the plastic top gear in place. Be very careful you don’t drop one of the screws because it can fall through the slots in the basket and be lost below.

9. Remove the plastic top gear.

10. Pull the plastic lower gear off of the splined shaft. It should pull right off.

11. Now you need to pull the basket up and off of the shaft. This is where you might have problems because the basket might be corroded to the shaft. If you can grab the basket on both sides under the outer lip and pull upward it might pull up. If not, then you will have to figure out a way to get it off.

12. Once the basket is off you will notice there is liquid inside of it. That is factory sealed in there so do not worry about that, it is normal.

13. With the basket is off you will be able to see that the shaft is probably corroded and the inside bearing on the basket is corroded. Clean these both off very good and check to see if the basket can easily go back on the shaft and slide up and down without getting stuck. You may need to sand and file the shaft a little bit to get it totally cleaned up. The inner bearing of the basket is plastic so it is pretty easy to clean with light sanding.

14. Reassemble in the reverse order and your done. Check to make sure the basket can easily float now by pulling up on it from the top inside lips.

If you still get the error, again--it's time to replace the RPS sensor.
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