Bosch Refrigerator E3 — Evaporator Sensor Fault / Defrost System Issue
Bosch Refrigerator · Error code E3
What E3 Means
The evaporator coil temperature sensor is out of range, which prevents proper defrost termination. Frost builds on the evaporator and airflow to the fresh-food side drops.
Symptoms
- E3 displayed
- Freezer cold but fridge warm
- Frost buildup on rear freezer wall
- Fan noise changes or stops
Common Causes
Defrost termination sensor reads open/short.
Water from defrost cycle has shorted the sensor pins.
Heater open; coil stays frosted and sensor never sees expected warm-up profile.
Water re-freezes on the coil and skews sensor readings.
How to Fix It
- Unplug the unit and manually defrost for several hours.
- Remove the rear freezer panel and inspect the evaporator coil for heavy frost.
- Test the defrost heater for continuity (should read a few hundred ohms typically).
- Test the evaporator thermistor against the chart in the tech sheet.
- Clear the defrost drain with warm water if blocked.
- Replace whichever component is out of spec, then run a forced defrost from service mode to confirm.
Parts You May Need
If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.
More Bosch Refrigerator Codes
Verified against manufacturer documentation: bosch-home.com
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.