Rank: Member
Groups: Registered
Joined: 5/19/2013(UTC)
Posts: 2
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STARTED OF WITH A CODE F70, checked harness and cleaned all terminals, inspected MCU and CCU looked ok, then nothing, just 3 beeps, would not turn on, did diagnostic test and get, C00, U11, U00, n00, nC, 3.25 any help would be great Steve
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Rank: Advanced Member
Groups: Senior Expert
Joined: 3/29/2009(UTC)
Posts: 11,699
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When I have these types of problems with the Duet models I try replacing the main control unit, sometimes that fixes it.
If you buy the part from this site and the control unit is not the problem you can return it.
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Rank: Member
Groups: Registered
Joined: 12/18/2014(UTC)
Posts: 1
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When I pressed start on my washer, it would beep three times and then nothing would happen. To get the error codes (on model WFW9200SQA12) I turned off the power, and pressed any button for 4 seconds, released for 4 seconds, and repeated 3 times. I got error codes C:00, C:01, U:00, and U:11. I opened the machine by removing the top, and basically just made sure that all of the wire connections were secure. After doing this I have run 3 loads of wash and it seems to be working fine.
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Rank: Member
Groups: Registered
Joined: 7/20/2015(UTC)
Posts: 1
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I have had this same problem with wfw9200sqa12: C:00 error codes during diagnostics, then after about a 3 minute pause, a f70 error. This is a communication error between the CCU "motherboard" and controls on the washer. Everything on the net suggested replacing a faulty board, motor control board, lid latch switch and possibly the panel control buttons.
I fixed it without buying anything: The individual harnesses electrodes that connect to the CCU are slipped directly onto metal foil connections printed on the board itself. With time/vibrations the harness connection electrodes must wear this foil out, and/or cause corrosion. A new CCU may fix this, at a cost of $250.
I took the motherboard out to the washer making sure I photographed the harness connections with my phone for future reassembly reference. It slides out toward the back of the washer a centimeter, then straight off the wall. I took the plastic housing off and inspected the electrodes and noticed some were scratched/worn.
I heated up my soldering iron and carefully added a thin film of soldier to each individual foil electrode tab on the board. There are about 30, so this takes some time. This thin film was made best by heating the electrode tab on the side that is closer to the center of the board, melting a very small bead of solder there, and dragging it to the edge of the board along the foil. It seems OK if it was built up a little, but make sure it doesn't cross over the a neighboring foil tab. I added solder to the tabs on the underside of the board, but it shouldn't matter as harness clips make redundant electrical connections to both sides of the board.
I reinstalled the board and it works like new.
It's true that the CCU's are defective, they just wear out too early. Fortifying the harness connections to the board using solder is an easy and inexpensive way to fix this problem.
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