Bosch Washer ER09 Error
Bosch washer ER09 error means there is no communication between the main control board and the inverter board. This is almost always either bad or corroded connections between the control or a wiring issue between the two boards.
This Bosch Washer ER09 error troubleshooting and repair information applies to model WFVC6450UC and all the models listed under the related models section below.
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