Having issue with machine throwing F70 and F71 codes. Have unplugged and plugged back in to maybe get it to reset itself but then as soon as it is plugged back in and press on power it just beeps at you and no lights come on. F70 and F71 are issues dealing with lack of communication between the UI and CCU thinking maybe the CCU is out. Already replaced the UI. Any ideas?
Hi.
I think that by this time you already fixed the problem. The codes indicate usually a fault that is either CCU or MCU.
Please read the tip below, explaining how to fix F70 and F71 problems.
The comment applies to Whirlpool built kenmore washers like the one in
question.
F70 and F71 are two logic board error codes that point at a communication error between the main log...
Regards.
Ginko.
Hello & Welcome to FixYa
F70 is a communication error
which is caused when no communication is detected from the user interface to
the CCU (central control unit). Please check the wiring to user interface and
the central control unit, if that is fine and you can see the drum rotating
then replacing the user interface is recommended repair. If the drum won't turn
then the CCU needs replacement. Please get back to me if you have any other
questions.
Kevin
I provided a complete list of error codes for this type of washer in the image below. The error codes vary by the exact model of HE3t washer that you have. Since you have an HE3t that is displaying the F70 and F71 codes, the list below should apply to your model. These are not listed in the owner's manual because they are intended for technicians. Use extreme caution if you follow any of the troubleshooting described in this information sheet. Unplug the washer and shut off the water supply before accessing internal components.
The F70 and F71 codes indicate that you have a communication error between the CCU (Central Control Unit or main machine control board) and the user interface touch pad assembly. Here are some troubleshooting tips:
Make sure that you have the washer plugged into a properly grounded 3 prong 120 volt AC electrical outlet.
Unplug the washer for 30 seconds to allow the control boards to power down and reset. Plug the washer back in but do not touch the power button (or any other buttons) for 1 full minute. This may reset the control board. Pressing the power button too quickly after reapplying electrical power to the washer can cause the F70 or F71 code since the CCU does not have time to recognize the user interface control.
If the above tip does not help then the most suspect component failure is the MCU (motor control unit -- motor control board at the bottom of the washer beside the drive motor). You can check for this failure by unplugging the washer and then pulling the MI3 connection on the CCU. The wiring diagram below has the MI3 connection highlighted in red. The connection has blue wires. The third image below shows this connection on the control board. The connections are labeled on the control board. Press the tab at the bottom of this plug down and then pull it out. Power up the machine with this connection unplugged and don't touch any buttons for 1 minute. If you then press the power button to turn on the washer and don't get the F70 or F71 code then the MCU at the bottom of the washer will likely need to be replaced to fix this problem. A technician would normally be needed to verify this failure and replace the MCU. The MCU is expensive ($423).
This troubleshooting information is based on a common HE3t model that displays the F70 and F71 codes. If you need more help, submit additional details and the full model number of your HE3t washer.
F70 and F71 are two logic board error codes that point at a communication error between the main log...
Regards.
Ginko.
))
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