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

Bosch B36Ct Freezer refrigerator ·

When 'E' or 'd' appears on the temperature display, the electronics have detected a fault. To resolve this, switch off the appliance, unplug it or switch off the circuit breaker, reconnect after 5 minutes, and switch it back on. If the message still appears, call Customer Service.

Source: B36Ct Freezer refrigerator Manual, Page 28

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