Bosch Refrigerator Error Code E9060

Error code E9060 on a Bosch refrigerator indicates a fault with Evaporator Sensor 1, specifically an open circuit or short circuit condition. The evaporator sensor is a negative temperature coefficient (NTC) thermistor mounted near or on the evaporator coil inside the freezer or fresh food compartment. Its job is to monitor evaporator coil temperature and feed that data to the main control board, which uses it to regulate defrost cycles and compressor operation. When the sensor signal falls outside the expected resistance range, the control board flags E9060 to alert that the reading is either absent (open circuit) or implausibly low in resistance (short circuit).

An open circuit condition means the sensor circuit has lost continuity, typically due to a broken wire, corroded connector, or a failed thermistor element that no longer conducts. A short circuit condition means two conductors in the sensor circuit are making unintended contact, collapsing resistance to near zero and sending an out-of-range voltage signal to the control board. Both conditions prevent the refrigerator from accurately tracking evaporator temperature, which can lead to improper defrost timing, frost buildup on the coil, and inadequate cooling performance throughout the cabinet.

Diagnosis involves inspecting the sensor wiring harness for visible damage, checking the connector pins for corrosion or pushed-back terminals, and measuring the thermistor resistance at a known temperature to verify it falls within spec. If the wiring and connectors check out, the sensor itself is likely the failed component and will need replacement. In some cases the main control board may be the source of the fault if it is misreading a signal from an otherwise functional sensor circuit.