Model #WFW9550WW10 WHIRLPOOL Residential Washers

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Error Codes

Error Code:

Condition:

Check/Repair:

Question and Answers

Q:

Whirlpool Duet washer - pair CCU and UI WFW9550WW10

A:

The F99 will display if there is mismatch of User Interface and CCU or corrupted EEPROM.

One of the two is mis-matched. This unit has two User Interfaces, the center UI and the right side UI. At this point, I strongly suggest calling a service technician diagnose and repair your washer.  Also, this is the part number for the right UI (W1042801, the center UI (W10283460) and the CCU is (W10424936). Be sure you ordering parts by the complete model number found on the washer.

Diagnostic Test:
NOTE: Washer must be empty and the control must be in the
OFF state.
1. Close the door.
2. Select any one key (except “STOP/CANCEL” and “CONTROL LOCK” [EOC]) and follow the steps below, using the same key:
Press/hold for 2-5 seconds and release, Press/hold Release, Press/hold Release, Press/hold Release and Press/hold and release. (Press and hold and release the same key 5 times.)
3. Upon release, all yellow/green console LED lights will turn ON for 5 sec.
4. If there are any failure codes stored by the washer, the display shows them.
Note: The last four errors will be displayed.
5. Press the same key to advance to the next code.
6. After the indication of error codes, the UI, CCU, and MCU SW version will be displayed.
7. The number of cycles since last clean washer cycle is displayed.
8. All green console LED lights will turn ON for 5 seconds.
9. Next the washer begins the automated diagnostic test.
10.To cancel out of service mode, press the “STOP” button.

If this does not work, call a service technician.

Read More
Joey S -
Sears Technician
December 15, 2014
A:

Hi Joey, That's literally everything I already knew. The CCU was the only part that was faulty. We purchased a new CCU, installed it, ran the diagnostic cycle. When that didn't work we purchased the a new UI, installed it, ran the diagnostic cycle. At every point we have verified that the part numbers and physical form factors of the new parts matched that of the part being replaced. At this point we've spent several hundred dollars replacing boards that seem to be working just fine, and no one has actually answered the questions that we've asked, including you. Maybe I should preface all requests for help by saying that small words aren't required as we have an Electrical Engineering degree, a Mechanical Engineering degree, a Computer Science degree, a Mathematics minor and an Electrical Engineering minor living in the house. We could build a new machine from a stack of parts. Telling me how to run the diagnostic cycle, when I've told you that we've run the diagnostic cycle repeatedly is not helpful.

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Erin -
December 15, 2014
A:

There is only two test, the diagnostic test and the History, Software version and diagnostic test. There is no "Service Cycle" test. Again, there are two UI in the control panel, and you did not state which one you've replaced but there is a good chance the one you did not replace may need replacing too.

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Joey S -
Sears Technician
December 15, 2014
A:

Oh Joey, aren't you just adorable. There actually seems to be only one test, as the diagnostic test begins by giving the error code history, and what I assume is the software/firmware versions. As for your use of "Service Cycle", this is from the link that you posted, as well as stated in the machine manual "Perform Service Cycle to pair the UI and CCU." So if being sarcastic and saying there is no "Service Cycle" makes you feel better, then go for it I guess, but maybe check the links that you post before doing so. The use of quotation marks to indicate sarcasm, while quaint, isn't really the mark of a high level of customer service skill. I'm terribly sorry that your reading comprehension is so low, but please don't take it out on me. It actually doesn't matter which UI I replaced, (the right side one), because as I stated, all boards were functioning properly, as indicated by the successful completion of the diagnostic cycle. For anyone else having this problem with their machine, this is what we found out. We got fed up with trying to get information out of Sears Parts or Whirlpool and called a technician out. The technician said that he would have done everything that we did - replaced the original, faulty CCU and run the diagnostic cycle. The diagnostic cycle is supposed to pair the CCU and UI at completion. As I said before, our machine was not doing this. The diagnostic cycle would run, all parts of the machine would function correctly, the cycle would end, and when the machine was restarted the F99 code would reappear. The technician called tech support, who called another higher level of tech support, who said that this was a known (but undocumented) issue with some machines, and they're replacing the machine. To reiterate - THIS IS A KNOWN ISSUE. The machine will give the F99 code for some reason that Whirlpool can't figure out, and the machine has to be replaced. I hope that this is helpful for someone else.

Read More
Erin -
December 17, 2014
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