Repairing a Whirlpool Sixth Sense ADG9020 Dishwasher with Error Code FB (by Vincenzo75)

Has your Whirlpool Sesto Senso dishwasher model ADG9020 stopped working and shown the dreaded FB error? Don’t worry! In this guide, we explain step-by-step how the issue was identified and resolved. Perfect for anyone who wants to understand the cause of the error and possibly fix it on their own — without immediately calling in a technician.

Appliance:
Whirlpool Sixth Sense Model ADG9020 Dishwasher

Issue:
The dishwasher starts but stops immediately, emits a beep, and displays the error code "FB."

Repair:
Previously, the filters, sump, and drain hose were cleaned and replaced to address the same problem. While it seemed resolved, the issue reoccurred after a month.
I opened the dishwasher and replaced the alternate valve and the water labyrinth, which were completely clogged. This finally eliminated the persistent beep and the "FB" error code.

Thank you
Vincenzo75.