Once washer hits spin cycle (12 min. left) it throws a DC code. Checked the TDS sensor - OK, motor control - OK, spinning the tub by hand in CCW feels smooth. Haven't taken apart to clean and lube clutch. Could the struts be worn if the clutch is okay? Don't want to throw hundreds into it unless I have to. Replaced a transmission a year ago and inlet valves as well.

To detect excessive wash tub movement and shut down the wash cycle. Here is a copy of my post from a real DIY forum;

Google this Neptune TL Washer FAV6800AWW 5 post down.

Here ya go.....in this post I discuss the issue related to unbalance error codes DC and UC;

Your FAV6800A or FAV9800A is going off balance with DC or UC unbalance error codes during spin cycle and you see/hear the wash tub banging around at the start of Spin Cycle of the wash cycle or a Spin Only cycle. If this is the condition the TDS (Tub Displacement Sensor) is working as designed and signaling the Control Board properly of an unbalance wash load condition.

The Control Board receives a varying D.C . Voltage from the TDS sensor and if the out of range D.C. Voltage limit continues the Control Board will halt the Spin Cycle and try to redistribute the wash load. If you are interested I will show you how to monitor the TDS input to the Control Board with a DVM.

The Control Board then starts the Spin Cycle again. If the wash tub/basket out of balance condition continues the Control Board will attempt another redistribute of the wash load. After several attempts (4 to 5 I believe) the Control Board will shut down the Spin Cycle and send a error code DC or UC to the LED display of the FAV6800A, my machine type. And I believe a text statement to the LCD screen of the FAV9800A machine i.e. something like "Unbalance Condition" I'm not sure what the text message is.

If you need help open a post in that repair forum and I will try help you through your issue.
The forum is free and my time is free I just don

Is the wash tub banging around in Spin Cycle with a wash load then failing with a dC or UC unballance error code?

If so the TDS is working as designed. Try a Spin Only cycle with no clothes in the wash basket. If it completes then the issue is most likely a clutch malfunction of your FAV6800A or FAV9800A machine. See this post Clutch Fix

Did you replace the TDS sensor or did a repair person? If it was a repair person did they try a Wet Load Spin Cycle after the TDS replacement?

If a repair person was called and the TDS replaced what troubleshooting steps did they take to warrant changing out the TDS? I would ask if the range of montion check of the TDS was checked for properation signaling action to the Control Board in Service Mode.

If your FAV6800A or FAV9800A wash tub is banging around in Spin Cycle of the Wash Cycle and your Control Board signals a dC or uC error code to the console I feel you have a Clutch malfunction. I feel the TDS is working as designed with the unblance error code shut down.
See my Clutch Fix post for more info related to dC and uC unbalance errors with the FAV6800A and FAV9800A TL’s and the repair action…….Rich

homeworker14,
You’re a owner/DIY’er type I enjoy working with I'm a technicial owner also not a repair person. Warning my post are long but with no BS or WAG's.

Good job troubleshooting except for the external 1.5VDC battery. I understand what you tried to do The TDS takes +12VDC into it and signals +3.0VDC to 0.0VDC for the full range of motion of the TDS and as you are aware approximately +1.5VDC for center position. So the Control Board sees analog DC swings from the TDS not a digital 1 or a 0.

Was your washer banging around during the start of a Spin Cycle of a wash Cycle or a Spin Only Cycle causing the original dC/uC unbalance errors? If not the TDS may have been bad from the get go. You will have to explain to me how you clip leaded in that 1.5VDC cell I’m curious. Keep in mind the +12.0VDC power supply on the Control board is referenced to the control board not machine Chassis ground. Here is a pic of me measuring +12.0VDC indicating that the lid latch is closed. I pick up Control Board Common from the lead on the cap I show on the board.



OK knowing that is this how you measured the +2.7VDC referenced to Control Board Common and Conn P3 Pin 11 the TDS Sensor input to the Control Board? Some Pics to help.



Also Check for corrosion at the 3 pin plug of the TDS.


You are performing your measurements at Conn P3 pin 11 TDS input and Control Board Common correct?

Let me know what you find. This BS board has message limits so I will post on Clutch issue in the next comment.....Rich

Thank you for Model Number and S/N the first two digits are your Serial Number is your Series number.
Yea that left side bleach dispenser is hard on the TDS the Left Hand Lid Lock also.
Is the washer banging around with the uC unbalance error?
If so see my Clutch Fix post I feel you have a possible issue with slipping One-Way Roller Clutches bearing in the Clutch Pulley.
With that much corrosion I’m concerned about the TDS 3 pin plug. But lets try the TDS check first because of the severe strut corrosion.
It’s in the Service Manual but I’ll type it out. Let’s make sure the TDS is signaling the Control Board correctly with this thru the lid test.
Tub Displacement Sensor Diagnostics check.
It is possible the Tub Displacement Sensor may have failed try this check which is in the Troubleshooting guide stored in your washer console or refer to the SM.

a. Enter the Service Mode by pressing and holding the Enviro Plus and Spin Only keys for three seconds or the display reads “00”

b. Press the Super Wash key display reads “in”…something like that.

c. Press Delicates the Display will show “UC” (Unbalance Closed).

d. Push tub to the back right corner of the machine the display should change to “UO” (Unbalance open). Release tub and the display will show “UC” (Unbalance Closed).

e. Press Hand Wash.

f. Pull tub to the front left corner while pushing the tub down the display should change to “UO” (Unbalance open). Release tub and the display will show “UC” (Unbalance Closed).

If you get these results then I feel your TDS is working as designed and signaling the Control Board correctly. What are your results?

I feel it is now time to remove the Clutch Pulley. Follow my post including the test to insure the One-Way Roller Clutches bearings are locking up solid in the CCW direction the Spin Cycle direction.
I hope you can extend the service life of your machine with clutch maintenance.
Let me know if I can help………Rich

more than likely it just needs a little leveling...lift front of washer . there are 2 leveling feet on each front corner under the washer.. they turn like a screw ..just adjust these feet till its level and you should be ok....shake the washer by hand . if it doesnt move it shoud be level,,,,an unlevel washer makes terrible noises ...as you know..thanks and have a great day

Hello leaweber,

Yes most times it is a Clutch malfunction . Is the machine failing with “dc” and or “UC” unbalance error codes in spin cycle? If you are you may have a Clutch malfunction or Tub Displacement Sensor failure more likely a Clutch issue.

You can do a quick TDS sensor check thru the lid just follow this from the Service Manual. If you machine will pass the TDS check the next step would be to remove the clutch from the machine and inspect as I describe in this post.

Tub Displacement Sensor check from the SM slightly modified;

Tub Displacement Sensor Diagnostics check. This test is done with the washer lid raised see page 19 for the details.

It is possible the Tub Displacement Sensor may have failed try this check which is in the Troubleshooting guide stored in your washer console or refer to the SM.

a. Enter the Service Mode by pressing and holding the Enviro Plus and Spin Only keys for three seconds or the display reads “00”

b. Press the Super Wash key display reads “in”…something like that.

c. Press Delicates the Display will show “UC” (Unbalance Closed).

d. Push tub to the back right corner of the machine the display should change to “UO” (Unbalance open). Release tub and the display will show “UC” (Unbalance Closed).

e. Press Hand Wash.

f. Pull tub to the front left corner while pushing the tub down the display should change to “UO” (Unbalance open). Release tub and the display will show “UC” (Unbalance Closed).

If you get these results your TDS sensor should be just fine. Time to look at a clutch repair/replacement. Let me know if you need help…. Rich aka dh1200s

The problem was with the component that i suspected, the motor control board. I replaced it and everything is operating as designed. Thanks for your feedback and confirmation of my thoughts.

HI. this uc code represents a no spin state of the unit. this is caused by a faulty Motor control assembly. you will need to replace the Motor control assembly. this will fix this issue and, restore the normal actions of the unit.

This Motor control assembly will cost about $219.00.

Hello srcoray,

Did you replace the clutch, just trying to get a feel for your hands on experience with the machine? If you did the work did your machine use the upper roller clutch bearing along with the clutch pulley mounted roller clutch bearing?

The FAV6800AW uses a reversing motor and motor controller that powers the motor and clutch pulley to rotate CW in Wash/Agitate cycle and CCW in Spin Cycle.

In Wash/Agitate cycle the roller clutch bearing should rotate freely CW allowing the agitator shaft to drive the transmission in wash cycle driving the tumblers to rotate only not the wash basket. In spin cycle the roller clutch bearing will lock up (one-way roller clutch bearing) driving the spinner shaft to rotate the wash basket and transmission CCW. Unless my thinking is wrong it sounds like the one way roller clutch bearing is frozen or dragging and not rotating freely in wash cycle rotating the wash basket CW. I’m an owner like you and will try to help.

Just a few other questions;

If you have a load of wet clothes in the wash basket and you select Spin Only cycle will the spin cycle complete with out dc/UC errors?

With the lid raised can you rotate the wash basket CW? It should not; it should only rotate CCW and do that with very little resistance.

Rich