Bosch Nexxt Washer Error Code Er:09 - E:09 - E 09 - E9
No communication between main control board and the motor control board
Unplug the washer and look for any loose or damaged wires on the control board and the motor control board. If the connections look okay, you may want to do a continuity on each one if the harness is bad replace it. If the harness checked out ok then replace the motor control board. In some cases, the main control board also must be replaced.
Part #: 445347 - Main Control Board
Part #: 436461 - Washer Motor Control Board
Part #: 421588 - Harness
Part #: 421593 - Harness
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Bosch Washer WFMC2100UC/01 Er:09 Error Repair video
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