Bosch Refrigerator Error Code E06

The E06 error code on a Bosch refrigerator indicates that the refrigerator compartment (RC) evaporator temperature sensor is returning a reading outside of its accepted operating range. Specifically, the control board flags this fault when the sensor reports a temperature at or above 60°C or at or below -55°C. Because both extremes fall far outside the normal operating envelope of a refrigerator evaporator, the board interprets these readings as a sensor fault rather than an actual temperature condition. The evaporator sensor is a negative temperature coefficient (NTC) thermistor whose resistance changes predictably with temperature, and readings outside this range point to an electrical fault in the sensor circuit rather than a genuine thermal event.

The three primary fault modes that trigger E06 are a broken sensor element, a short circuit within the sensor or its wiring harness, and a loss of contact at a connector or terminal. A broken sensor element causes the circuit to go open, driving the resistance to an extremely high value that the control board interprets as a temperature below -55°C. A short circuit collapses resistance toward zero, which the board reads as a temperature above 60°C. A loose or corroded connector can produce intermittent open or high-resistance conditions, causing the reading to drop below the minimum threshold.

Diagnosis begins at the sensor itself. The wiring harness running from the evaporator sensor to the main control board should be inspected for visible damage, pinching, or corrosion at the connector pins. Resistance across the sensor terminals can be measured with a multimeter to determine whether the thermistor is functioning within its expected range at a known ambient temperature. If the sensor measures open or near-zero resistance, replacement is the appropriate next step. If resistance reads plausibly but the error persists, the wiring harness and board connector contacts should be examined more closely.