E30
Bosch Washing Machine
Severity: ModerateWhat Does This Error Mean?
The E30 error on your Bosch washer means there is a problem with the NTC temperature sensor inside the drum. NTC stands for Negative Temperature Coefficient — it is a small probe that monitors water temperature during washing. If it fails or reads an impossible temperature, the machine stops to prevent overheating or washing at the wrong temperature.
Affected Models
- Bosch 300 Series
- Bosch 500 Series
- Bosch 800 Series
- Most Bosch front-load washers
Common Causes
- The NTC temperature sensor has failed and is giving incorrect readings
- The sensor wiring harness has come loose from the control board or the sensor itself
- The wiring to the NTC sensor is damaged or has corroded connections
- The heating element has failed in a way that confuses the temperature sensor readings
- The control board has a fault affecting how it reads the NTC sensor signal
How to Fix It
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Unplug the washer from the wall for five minutes, then plug it back in. Attempt a cool wash cycle (30°C or less) to test.
A brief power reset can sometimes clear a temporary sensor glitch.
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Try selecting a cooler wash temperature. If the machine works at 30°C but fails at higher temperatures, the sensor may be partially working.
This test also tells you whether the heating element or the sensor is the source of the problem.
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Check the wiring harness connecting the NTC sensor to the control board. Look for loose connectors or any visible wire damage.
Accessing the NTC sensor usually requires removing the back panel of the machine.
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If you have a multimeter, test the NTC sensor resistance. At room temperature it should read around 6,000–10,000 ohms (6–10 kΩ). A reading of open circuit (OL) means it has failed.
The resistance decreases as temperature increases — this is normal behavior for an NTC sensor.
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Replace the NTC sensor if it fails the test. It is a small, inexpensive part — typically $15–$35 — but requires partial machine disassembly to access.
Have a technician do this if you are not comfortable accessing internal washer components.
When to Call a Professional
If unplugging and resetting the machine does not clear E30, have a technician test the NTC sensor resistance. NTC sensor replacement is typically $80–$180 including parts and labor. Do not attempt high-temperature washes until this is resolved.
Frequently Asked Questions
What is an NTC sensor in a washing machine?
NTC stands for Negative Temperature Coefficient. It is a small resistor whose electrical resistance changes predictably as the temperature changes. The washer's control board reads this resistance to calculate the exact water temperature. This ensures your clothes wash at the temperature you selected.
Can I wash clothes while E30 is showing?
You can attempt a cold wash (no heating), but it is best to avoid using the machine until E30 is resolved. With a faulty temperature sensor, the machine cannot properly control water heating. This risks damaging delicate fabrics or not cleaning properly.
How much does an NTC sensor cost for a Bosch washer?
The NTC temperature sensor part is inexpensive — usually $15–$35. However, labor to access and replace it adds $60–$120 at most repair shops. Total cost is typically $80–$160 for a professional repair.