E40Bosch Refrigerator — Bosch Refrigerator E40 Error Code
Freezer temperature sensor failure
Severity
Warning
Difficulty
Moderate
Est. Cost
What's Happening
The freezer compartment temperature sensor has failed or is reading outside its expected range. The freezer may run constantly or not cool properly.
How to Fix It
Unplug for 5 minutes. If E40 persists, test the freezer NTC sensor with a multimeter and replace if readings are out of spec. Check the wiring harness between the sensor and main control board.
Frequently Asked Questions
What does E40 mean on a Bosch refrigerator?
E40 means the freezer temperature sensor has failed. The control board can't get accurate freezer temperature readings.
Will my Bosch freezer still cool with E40?
It may cool intermittently or run constantly. Without accurate data, the compressor can't cycle properly, increasing energy use and potentially affecting food safety.
Is E40 the same as E36 on a Bosch fridge?
No. E36 is the fridge compartment sensor, E40 is the freezer sensor. They're separate sensors in different locations.