What does it mean when 'E' or 'd' appears on the temperature display?

Bosch B36Fd Freezer Refrigerator ·

The 'E' or 'd' on the temperature display indicates that the electronics have detected a fault. To resolve this, switch off the appliance, unplug it or switch off the circuit breaker, and reconnect after 5 minutes before switching the appliance back on. If the message still appears after restarting, contact Customer Service. (Page 27)

Source: B36Fd Freezer Refrigerator Manual, Page 27

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