Bosch Washer Error Code E:07

Error code E:07 on a Bosch washer indicates that the NTC (Negative Temperature Coefficient) thermistor has developed a short circuit condition. The NTC thermistor is a resistive temperature sensor responsible for monitoring the water temperature inside the wash drum. When functioning correctly, the NTC's resistance decreases as temperature rises, allowing the control board to regulate heating accurately. A shorted NTC sends an out-of-range signal to the control board, which interprets this as a fault and halts operation to prevent overheating or inaccurate temperature control.

The two primary sources of this fault are a failed NTC thermistor itself or a compromised wire harness connecting the sensor to the control board. A shorted thermistor typically occurs when internal sensor components fail, resulting in near-zero resistance regardless of water temperature. Wire harness problems can include chafed insulation causing two conductors to contact each other, a pinched harness, or corrosion at connector terminals creating an unintended electrical path. Both conditions produce the same shorted signal at the control board.

Diagnosing E:07 requires running test program P16, which exercises the heating and temperature sensing circuit and allows the technician to observe sensor behavior directly. Following that, the NTC thermistor and its associated wiring should be inspected and tested with a multimeter. A shorted NTC will show very low or zero resistance across its terminals rather than the expected temperature-dependent resistance value. Connector terminals should be inspected for corrosion, moisture intrusion, or physical damage before replacing any components.