Bosch washer ER05 error means the NTC ( The water temperature sensor) has failed or the wiring from the board to the NTC is bad. Check the wiring for bad connections, if the wiring is good replace the NTC. The replacement sensor can be ordered from the link below.
This Bosch Washer ER05 error troubleshooting and repair information applies to model WFVC6450UC and all the models listed under the related models section below.
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