E1
Bosch Refrigerator
Severity: CriticalWhat Does This Error Mean?
Bosch fridge E1 error means the freezer temperature sensor has failed or is reading outside the valid range. Unplug the fridge for 5 minutes to reset the display — if E1 returns immediately, the sensor needs replacement.
Affected Models
- Bosch Serie 2 Fridge-Freezer
- Bosch Serie 4 Fridge-Freezer
- Bosch Serie 6 Fridge-Freezer
- Bosch Serie 8 Fridge-Freezer
- Bosch NoFrost Refrigerator
Common Causes
- Freezer temperature sensor (NTC thermistor) failed — open or short circuit
- Sensor wiring connector loose or corroded
- Sensor physically damaged by ice
- Control board fault — incorrect sensor reading
- Actual freezer temperature genuinely too high — real over-temperature condition
How to Fix It
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Unplug and reset the fridge.
Unplug the refrigerator from the wall for 5 minutes. Plug back in and check if E1 clears. A transient sensor glitch is sometimes cleared by a full power cycle.
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Check the actual freezer temperature.
Place a thermometer in the freezer for 1 hour. If the actual temperature is above -10°C, the freezer genuinely has a cooling problem that is triggering a real over-temperature alarm. Refer to the Bosch Fridge Not Cooling guide.
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Check the defrost system.
On Bosch NoFrost models, E1 can appear when the defrost system fails and ice blocks the evaporator, causing the freezer temperature to rise. Manually defrost by unplugging the fridge for 24 hours with all doors open, then restart.
When to Call a Professional
If E1 persists after a power cycle and the fridge is cooling normally, the temperature sensor or its wiring needs replacement by a Bosch-authorised technician.