E803
Bosch
Temperature sensor out-of-range or calibration fault
Bosch oven displays E803 and temperature control is erratic
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Aging or drifting NTC sensor, Poor sensor connection, Faulty main control ADC circuit, Incorrect sensor type installed
How to Fix / Troubleshooting
Safety first: Disconnect power before working on wiring.
- Check sensor value: Measure the sensor resistance at room temperature and compare to Bosch specifications. If significantly off, replace the sensor.
- Inspect connector: Clean and reseat the sensor connector at the control board. Lightly tug each wire to ensure it is crimped securely.
- Verify correct part: If the sensor was replaced previously, confirm that the installed part number matches the Bosch parts list for your model.
- Control board: If a new, correct sensor still results in E803, the main control board's measurement circuit is likely defective and the board should be replaced.
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Repair Difficulty
Hard
4/5
Required Part
Oven Temperature Sensor (NTC)
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