We have a Delongi dw47s dishwasher that show a Error3 fault?

Do a bit of searching before you reach for the woring diagram.

2 minutes on Google (which you DID do, didn't you?) produced thefollowing:

http://www.fixya.com/support/t9736668-err_3_shows_led_screen_delonghi

and

http://howtomendit.com/answers.php?id=47741

The latter seems to suggest there is water leaking into the base and being picked up by a safety device.

Both threads give what appears to be a short term fix.

Read the second thread all through as it suggests apossible cause.

Then learn how to use Google Search

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March 2015