Washer will not start and displays E90 or a related communication error.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Loose connector between display board and main PCB, Faulty user interface board, Defective main control board, Software corruption

Safety: Unplug the appliance before removing the control panel.

Reseat connectors: Remove the control panel and main PCB housing. Unplug and reconnect the ribbon cables and harnesses between the boards.
Check for damage: Inspect both boards for burn marks, corrosion, or cracked solder joints.
Power reset: Leave the machine unplugged for 10–15 minutes, then reconnect and test.

If E90 persists, one or both control boards may need replacement. This is best handled by an authorized Zanussi service technician.

Professional Required 5/5

Main Control Board

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