We’re so sorry to hear about this issue. The E5 error appears when there’s water in the sump. Sometimes, after drying, a bit of condensation can remain and trigger the sensor. You can try holding down the Wash and Sterilize/Dry buttons until “DC” appears (this means “discharging”), then empty the waste water tank and restart the process. If this doesn’t resolve the issue, please reach out to our Customer Care team for further assistance. All of our machines come with a warranty that covers situations like this.