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Ok the Sd error code indicates that the unit has detected too much suds and has shut down until the error is cleared.
Try running a load with no soap and that should clear the problem.
If that does not solve the problem, then you will need the service manual to perform further diagnostics to the unit.
I am uploading a copy of the manual for your retrival. It is a large file so it will be about another 10-15 minuets. I will post the download link when it is done.
Ok unplug the unit from the wall outlet for 10 minuets. That should reset the control computer.
Please advise if it does not.
Ok here is the link for the service manual download.
Please let me know if you have any further concerns.
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The diagnostics for the Sd error code are on page 6-1 of the manual. Please follow the directions for the error code. Doing so will tell you where the fault lies.
From the sound of things I'm afraid that it will be in the main controller board. As the part is expensive, I recommend that you exhaust all other possibilities first.
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Follow the directions below to download the file.